Free · No signup · Works offline

Handy tools for every task

Calculators, converters, and generators — fast, free, and no signup needed.

or press ⌘K anywhere

Browse all tools →

New

Recently added

✦ NewAbsolute Difference Calculator, |a - b| and PercentFind the absolute difference between two numbers, which is larger, and the gap as a percent of each number and of their mean. Shows the working. Free, private, runs in your browser.calculator
✦ NewASCII Art Generator: Text to Big Banner LettersTurn text into large ASCII-art letters in block, small or shadow banner fonts. Choose the drawing character, letter spacing and a maximum width that wraps words, then copy or download the art. Nothing is uploaded.text
✦ NewASCII Table: Codes 0-127 in Hex, Octal, Binary, DecimalAll 128 ASCII codes with decimal, hex, octal, binary, HTML entity, character and control-code names such as LF Line Feed. Filter by class, sort any column, view Windows-1252 128 to 255, copy as text or CSV. Nothing is uploaded.text
✦ NewASCII Tools: Validate, Transliterate, Flip Bits, UTF-8Convert Unicode to plain ASCII, find non-ASCII characters, validate UTF-8 bytes or files, show ASCII as UTF-8 bytes, flip or shuffle ASCII bits, and generate ASCII characters, random ASCII or random UTF-8. Nothing is uploaded.text
✦ NewAverage Color Finder: Mean Color of an Image or AreaFind the average color of a whole image or of a rectangle you drag on it. Get the hex, RGB and HSL values, the brightness, and whether black or white text reads better on it. Runs in your browser. Nothing is uploaded.image
✦ NewBAC Calculator: Blood Alcohol Content EstimateEstimate blood alcohol content with the Widmark formula from body weight, sex, drinks and time since drinking. Shows peak and current BAC in % and ‰ and the time to 0.08%, 0.05% and zero. It cannot tell you that you are safe to drive.calculator
✦ NewBarcode Generator, Code 128, EAN-13, UPC, Code 39Make a barcode in your browser: Code 128, Code 39, EAN-13, EAN-8, UPC-A or ITF-14. Check digits are added and checked for you. Set bar width, height and colours, then download SVG or PNG. Nothing is uploaded.generator
✦ NewBase32, Base58 and Hex Encoder and Decoder OnlineEncode text or a file as Base32, Base32hex, Base58, Base58Check or hex, and decode them back, in your browser. Decoding ignores spaces and case, verifies Base58Check checksums and names the first bad character. Nothing is uploaded.converter
✦ NewBase64 Encoder and Decoder, Free and PrivateEncode text or files to Base64 and decode Base64 back to text or a file in your browser. URL-safe alphabet, line wrapping, data URLs. Nothing is uploaded.converter
✦ NewBinary Calculator: Add, Subtract, AND, OR, XOR, ShiftAdd, subtract, multiply and divide binary or hex numbers of any length, and apply AND, OR, XOR, NAND, NOR, NOT, shifts, rotations, bit counts and shuffles. Results in binary, hex and decimal. Nothing is uploaded.calculator
✦ NewBinary to Image: Draw Bits or Hex Bytes as a PNGDraw binary digits or hex bytes as pixels in your browser: 1 bit per pixel with your own colours, 8-bit greyscale or 24-bit RGB. Set the width and scale, then download a PNG. Nothing is uploaded.image
✦ NewBody Fat Calculator: US Navy, BMI and Army MethodsEstimate body fat percentage with the US Navy tape method, a BMI-based formula or the US Army 2023 one-site tape test, in metric or US units. Shows fat mass, lean mass and the ACE category. Nothing is uploaded.calculator
✦ NewBody Surface Area Calculator: Mosteller, Du Bois, BSAEstimate body surface area in square metres from weight and height with the Mosteller, Du Bois, Haycock, Gehan and George, and Boyd formulas side by side, in metric or US units. Nothing is uploaded.calculator
✦ NewBody Type Calculator: Body Shape and Waist-to-Hip RatioFind your body shape (hourglass, bottom or top hourglass, spoon, triangle, inverted triangle, rectangle) from bust, waist, high hip and hips with the FFIT rules, plus the waist-to-hip ratio against WHO thresholds. Nothing is uploaded.calculator
✦ NewBra Size Calculator: US, UK, EU, FR and AU SizesFind your bra size from under-bust and bust measurements in cm or inches. Band to the nearest even inch, cup by the inch difference, EU and FR by EN 13402, AU bands and sister sizes. Nothing is uploaded.calculator
✦ NewBTU Calculator: Air Conditioner Size for a RoomFind the cooling BTU per hour, tons and kilowatts a room needs from its size, insulation, sun, occupants and kitchen. Add a temperature rise to get a heating load too.calculator
✦ NewBulk Color Extractor: Colors of Many Images at OncePull the top 5 colors and the average color from up to 20 images in your browser. One row per image with its thumbnail, hex codes and shares. Export the table as CSV or JSON. Nothing is uploaded.image
✦ NewBusiness Days Calculator: Add Days or Count WorkdaysAdd or subtract business days from any date, or count the working days between two dates. Skips weekends and, if you choose, US federal or UK bank holidays and your own days off.calculator
✦ NewCalorie Calculator: BMR, TDEE and Goal CaloriesEstimate your BMR, maintenance calories (TDEE) and daily calories to lose or gain 0.25, 0.5 or 1 kg a week with the Mifflin-St Jeor, revised Harris-Benedict or Katch-McArdle equation, in kcal or kJ, metric or US units. Nothing is sent anywhere.calculator
✦ NewCalories Burned Calculator: MET Values for 60 ActivitiesEstimate the calories an activity burns from its MET value, your weight in kg or lb and the duration. Search 60 activities from the 2011 Compendium of Physical Activities, each with its code, or enter your own MET. Runs in your browser; nothing is sent.calculator
✦ NewCBOR Encoder and Decoder: JSON to CBOR and BackEncode JSON to CBOR as hex or Base64 and decode CBOR hex, Base64 or files to JSON or diagnostic notation in your browser. RFC 8949, exact 64-bit integers, deterministic encoding. Nothing is uploaded.converter
✦ NewCode Formatter for JS, TS, CSS, HTML, Markdown, YAMLFormat JavaScript, TypeScript, JSON, CSS, SCSS, Less, HTML, Markdown and YAML with Prettier in your browser. Auto-detect the language, set the indent, quotes and width. Errors show the line and column. Nothing is uploaded.converter
✦ NewCoin Flipper: Flip 1 to 100 Coins, Heads or TailsFlip a coin online, or up to 100 coins at once, with an animated result, a running tally of heads and tails with percentages and a history of your last 50 flips. Random and private.generator
✦ NewColor Extractor: Dominant Colors of an ImageGet the dominant colors of any image in your browser, 2 to 16 of them, each with hex, RGB, HSL and its share. Sort by share or hue, skip near-white or near-black, export CSS, JSON or PNG. Nothing is uploaded.image
✦ NewColor Palette Generator, Schemes and Random, FreeMake a color palette in your browser from one base color: complementary, analogous, triadic, tetradic, square or monochromatic, or press the space bar for a random one. Lock swatches, check contrast, export CSS, JSON or PNG. Nothing is uploaded.generator
✦ NewCompound Interest Calculator with Monthly DepositsSee how savings grow with compound interest. Enter a starting amount, rate, years, compounding frequency and regular deposits to get the final balance, total interest and a year-by-year table.calculator
✦ NewConcrete CalculatorFind how much concrete a slab, footing, column, tube, curb and gutter or steps need. Mix units per field, add a waste allowance and get cubic yards, cubic metres, litres, 40 to 80 lb bags, truck-ready totals and a cost estimate.calculator
✦ NewCRC Calculator: CRC-8, CRC-16, CRC-32, CRC-64 OnlineCalculate CRC-8, CRC-16, CRC-32 and CRC-64 checksums of text, hex bytes or a file in your browser. Every common preset from the CRC RevEng catalogue at once, plus custom models. Nothing is uploaded.calculator
✦ NewCSS Minifier and Beautifier, Free and PrivateMinify CSS to save bytes, or beautify it with one declaration per line. Strings, urls, custom properties and calc() are kept intact, and errors show the line and column. Nothing is uploaded.converter
✦ NewDays Until Calculator: Countdown to Any DateCount the days, weeks and months until any date, a holiday such as Christmas, New Year or Easter, or your next birthday, with a live countdown and the weekday it falls on.calculator
✦ NewDensity Calculator: Mass, Volume and ρSolve density, mass or volume from the other two. Switch units such as kg/m³, g/cm³ and lb/ft³, see the formula ρ = m / V and every step, free and private in your browser.calculator
✦ NewDepreciation CalculatorCalculate depreciation with straight line, declining balance, double declining balance, sum-of-years digits or units of production. Get a year-by-year book value schedule, handle a partial first year, and copy it as CSV.calculator
✦ NewDigit Tools: Digit Sum, Reverse, Sort, PalindromesApply one digit operation to a list of integers of any size: digit sum and product, increment, delete, replace, reverse, shuffle or sort digits, palindromes, sign, thousands separators, chunks and fancy Unicode digits. Results one per line. Nothing is uploaded.calculator
✦ NewDiscount Calculator: Sale Price and Percent OffWork out the sale price after a percentage or fixed discount, stack two discounts, find the percent off between two prices and add sales tax. Shows how much you save.calculator
✦ NewDue Date Calculator: Pregnancy Due Date and WeeksEstimate your baby's due date from the first day of your last period, the conception date or an IVF transfer date. See how many weeks pregnant you are, your trimester and key milestones.calculator
✦ NewE = mc² Calculator: Mass-Energy EquivalenceSolve energy or mass with E = mc². Use joules, kWh, eV or tonnes of TNT for energy and kg, g or atomic mass units for mass, with c fixed at 299,792,458 m/s. Free and private in your browser.calculator
✦ NewECDSA Key Generator, Sign and Verify OnlineGenerate ECDSA key pairs, sign messages and verify signatures on secp256k1, P-256, P-384 and P-521 in your browser. SHA-2, SHA3-256 or Keccak-256 hashing, DER or compact signatures, deterministic RFC 6979. Nothing is uploaded.generator
✦ NewElastic Potential Energy Calculator: U = ½kx²Solve spring energy, spring constant or stretch with U = ½kx². Use joules, kJ or ft·lbf and N/m, N/cm or lbf/in, with every step shown. Free and private in your browser.calculator
✦ NewEncryption Tool: AES, DES, Triple DES, RC4 OnlineEncrypt and decrypt text with AES (GCM, CBC, CTR, CFB, ECB), DES, Triple DES, Speck, RC4 or XXTEA, using an OpenSSL-compatible passphrase or a raw key and IV. Base64 or hex output. Nothing is uploaded.converter
✦ NewExponent Calculator: Powers, Logs and RootsRaise a number to any power, solve for the exponent or find the n-th root. Handles negative and fractional exponents, exact big integers and scientific notation, free and private in your browser.calculator
✦ NewFibonacci Generator: Sequence, n-th Term and LucasList the first n Fibonacci numbers or find the n-th term exactly, up to 1000 terms. Use custom seeds such as Lucas numbers, pick the start index, and compare F(n+1)/F(n) with the golden ratio.generator
✦ NewForce Calculator: F = m × a (Newton's 2nd Law)Solve force, mass or acceleration from the other two with Newton's second law, F = m·a. Pick units such as N, lbf, m/s² and g, and see each step. Free and private.calculator
✦ NewFraction Calculator: Add, Simplify, Mixed NumbersAdd, subtract, multiply and divide fractions, mixed numbers and decimals exactly, with the least common denominator and every step shown. Get the simplified fraction, mixed number and repeating decimal, or create Unicode fractions like ½ and ²²⁄₇. Nothing is uploaded.calculator
✦ NewFriction Calculator: Ff = μ × NSolve friction force, coefficient of friction or normal force with Ff = μN. Includes presets for rubber, steel, wood, glass, ice and Teflon, plus a flat and incline helper. Free and private in your browser.calculator
✦ NewFuel Economy Converter: MPG, km/L and L/100 kmConvert fuel economy between MPG (US), MPG (UK), km/L, L/100 km, mi/L and km/gal. See every unit at once, the inverse L/100 km formula and a table of common values.converter
✦ NewGCD and LCM Calculator with Euclidean StepsFind the greatest common divisor and least common multiple of two or more integers of any size, with every Euclidean algorithm step and Bézout coefficients. Exact, free and private in your browser.calculator
✦ NewGerman Grade Converter: GPA and % to German GradeEstimate your German grade from a US GPA or a percentage with the modified Bavarian formula. See the German term, pass or fail, the formula and tables. Scales are editable.converter
✦ NewGFR Calculator: eGFR by CKD-EPI 2021 and SchwartzEstimate kidney function from serum creatinine in mg/dL or µmol/L with the race-free CKD-EPI 2021 equation for adults or the bedside Schwartz equation for children, and see the KDIGO G1 to G5 category. Nothing is uploaded.calculator
✦ NewGravel CalculatorEstimate gravel for a driveway, path or drainage bed. Enter the area and depth in any units to get cubic yards, weight in US tons or tonnes at an editable density, truck loads and an optional cost.calculator
✦ NewGravitational Potential Energy Calculator: U = mghSolve potential energy, mass, gravity or height with U = mgh. Pick Earth, Moon, Mars, Jupiter and more, in joules, kJ or ft·lbf. Free and private, runs in your browser.calculator
✦ NewGross Pay Calculator, Hourly and Salary, Free and PrivateCalculate gross pay from an hourly rate with overtime and double time, or from a salary. See pay per period, month and year, plus bonus and commission, before any tax.calculator
✦ NewHash Calculator: SHA-3, BLAKE2, KMAC, Keccak OnlineCompute one of 32 hashes of text or a file in your browser: SHA-3, Keccak-256, SHAKE, cSHAKE, KMAC, BLAKE2, BLAKE3, RIPEMD, SHA-2, MD2, MD4 and MD5. Keys, customisation strings, variable output length, hex or Base64, compare field. Nothing is uploaded.generator
✦ NewHash Generator: MD5, SHA-1, SHA-256, SHA-512 OnlineCompute MD5, SHA-1, SHA-224, SHA-256, SHA-384 and SHA-512 of any text or file at once in your browser, in hex or Base64, and compare with an expected hash. Nothing is uploaded.generator
✦ NewHeight Calculator: Predict a Child's Adult HeightPredict a child's adult height from the parents' heights by the mid-parental method, with its ±8.5 cm target range, plus the twice-the-height-at-age-2 rule. Enter cm or feet and inches. Nothing is uploaded.calculator
✦ NewHex to RGB Converter with Alpha, Free and PrivateConvert hex colour codes to rgb() and rgba() and back in your browser, including #RGBA and #RRGGBBAA, with percentages, HSL, swatch previews and a colour picker. Nothing is uploaded.converter
✦ NewHooke's Law Calculator: F = k × xSolve spring force, spring constant or displacement with F = kx. Use N/m, N/cm or lbf/in and m, cm, mm or in, with the sign explained. Free and private in your browser.calculator
✦ NewHours Calculator: Time Between Two TimesCalculate the hours and minutes between a start and an end time, overnight shifts included, minus unpaid breaks. Shows the result as hours and minutes and as decimal hours for payroll.calculator
✦ NewHTML Entity Encoder and Decoder, Free and PrivateEncode text as HTML entities and decode named, decimal and hex character references back to text in your browser. Special characters only, non-ASCII or everything, decimal or hex. Nothing is uploaded.converter
✦ NewHTML Formatter, Indent and Beautify HTML, PrivateIndent messy or one-line HTML in your browser. Choose 2 spaces, 4 spaces or tabs. Only whitespace changes, and pre, textarea, script and style content is kept exactly. Nothing is uploaded.converter
✦ NewHTML Minifier, Shrink HTML and See Bytes SavedRemove the whitespace and comments HTML does not need and see how many bytes you saved. Four options, and pre, textarea, script and style content is kept exactly. Nothing is uploaded.converter
✦ NewIdeal Gas Law Calculator: PV = nRTSolve pressure, volume, moles or temperature with PV = nRT. Use atm, kPa, psi, litres, °C, °F or K and see the number of molecules. Free and private in your browser.calculator
✦ NewIdeal Weight Calculator: Robinson, Miller, Devine, HamwiEstimate your ideal body weight by the Robinson, Miller, Devine and Hamwi formulas side by side, with the healthy weight range for your height from BMI 18.5 to 24.9. Centimetres or feet and inches, results in kg and lb. Nothing is uploaded.calculator
✦ NewImage Color Picker: Get Hex and RGB from a PhotoPick a color from any image in your browser. Hover to magnify 11 by 11 pixels, click to pin hex, RGB and HSL values, zoom and pan, or use the arrow keys. Nothing is uploaded.image
✦ NewImage Compressor: Compress JPG, PNG, WebP, AVIFCompress JPG, PNG, WebP and AVIF images in your browser. Pick a quality level or a target file size. Your files never leave your device. Free, no signup, no upload.image
✦ NewImage Converter: PNG, JPG, WebP, AVIF, BMP, GIFConvert images between PNG, JPG, WebP, AVIF, BMP and GIF in your browser. Your files never leave your device. Free, no signup, no upload.image
✦ NewImage Cropper: Crop, Rotate and Flip a Photo OnlineCrop a photo with a draggable box, aspect presets such as 1:1 and 16:9, or exact pixel values. Rotate, flip, then save as PNG, JPEG or WebP at full size. Runs in your browser. Nothing is uploaded.image
✦ NewImage Filter: Grayscale, Sepia, Blur and Photo EffectsApply grayscale, sepia, invert, brightness, contrast, saturation, hue, blur, sharpen and vignette to a photo, or pick a preset. Compare before and after, then save at full size. Runs in your browser. Nothing is uploaded.image
✦ NewImage Resize Calculator: Keep the Aspect RatioFind the new height or width of an image when you resize it and keep the aspect ratio. See the reduced ratio, scale percent and megapixels before and after. No file needed.image
✦ NewImage Resizer: Resize Photos by Pixels or PercentResize PNG, JPG, WebP, AVIF, BMP and GIF pictures in your browser by pixels, percent or to fit a box. Keep the aspect ratio, resize many at once. Nothing is uploaded.image
✦ NewImage to Base64 Converter, Data URL and CSS SnippetsTurn a PNG, JPEG, WebP, GIF, BMP or AVIF image into Base64, a data URL, an img tag or a CSS url(), with sizes and one-click copy. Paste Base64 to get the picture back. Nothing is uploaded.image
✦ NewImages to PDF Converter: JPG, PNG, WebP to PDFTurn JPG, PNG, WebP, AVIF, BMP and GIF pictures into PDF files in your browser, one per image or combined into a single document. Nothing is uploaded.converter
✦ NewImpulse Calculator: J = F·Δt and J = m·ΔvSolve impulse from force and time, or from a change in momentum, m(v2 − v1). Solve any missing value, with each step shown. Free and private in your browser.calculator
✦ NewIP Address Converter: IPv4 and IPv6 to Binary and HexConvert IPv4 and IPv6 addresses to binary, hex and decimal and back in your browser, one per line. RFC 5952 canonical IPv6 output and a clear reason for every bad line. Nothing is uploaded.converter
✦ NewJSON Compare: Find Differences Between Two JSON FilesCompare two JSON documents by structure in your browser. See every added, removed, changed and type-changed value with its path, ignore key or array order, and get a summary count. Nothing is uploaded.converter
✦ NewJSON Formatter and Validator, Free and PrivateFormat, minify and validate JSON in your browser. Pick 2 spaces, 4 spaces or tabs, sort keys, and see errors with the line, column and offending text. Big numbers stay exact. Nothing is uploaded.converter
✦ NewJSON Viewer, Collapsible Tree and Search, PrivateOpen JSON as a collapsible tree in your browser. Expand or collapse branches, search keys, and copy any value or its path. Big numbers stay exact and long arrays load in pages. Nothing is uploaded.converter
✦ NewJWT Decoder and Verifier, Free and PrivateDecode a JSON Web Token in your browser, read its claims and expiry, and optionally verify the signature with HS, RS or ES keys. Tokens and keys never leave your device.converter
✦ NewKinetic Energy Calculator: KE = ½mv²Solve kinetic energy, mass or speed with KE = ½mv². Use m/s, km/h or mph and joules, kJ or kWh, and see each step. Free and private, runs in your browser.calculator
✦ NewLean Body Mass Calculator: Boer, James, Hume, PetersEstimate lean body mass from sex, age, weight and height with the Boer, James and Hume formulas side by side, or the Peters formula for children under 14. Shows kg, lb and implied body fat. Nothing is uploaded.calculator
✦ NewList Editor: Filter, Slice, Rotate, Count and Pick ItemsEdit a list of items in your browser: delete empty or repeated items, filter, find, replace, slice, rotate, group, duplicate, count the most frequent items, pick random items or build custom lists. Nothing is uploaded.text
✦ NewList Formatter: Bullets, Numbering, Quotes and ColumnsFormat a list in your browser: add or remove bullets and numbering, prefixes, suffixes and quotes, pad, trim, wrap, change or normalize separators, join items, arrange in columns, colour items as HTML or draw the list as a PNG. Nothing is uploaded.text
✦ NewList Sorter: Alphabetical, Numeric, Natural, RandomSort a list alphabetically, naturally, numerically or by length, or shuffle it, in your browser. Any separator, trim, remove blanks and duplicates. Nothing is uploaded.text
✦ NewMacro Calculator: Protein, Carbs and Fat in GramsSplit a daily calorie target, typed or estimated from your details, into grams of protein, carbohydrate and fat with balanced, low-fat, low-carb, high-protein or custom percentages, beside the AMDR ranges in grams. Nothing is sent anywhere.calculator
✦ NewMatrix Calculator: Inverse, Determinant, TransposeFind the exact inverse, determinant or transpose of a matrix up to 10 × 10 with integers, decimals or fractions, shown as fractions or decimals. Also generates identity matrices, random integer matrices and random vectors. Nothing is uploaded.calculator
✦ NewMolecular Weight Calculator: Molar Mass of Any FormulaType a chemical formula such as Ca(OH)2 or CuSO4·5H2O and get its molar mass in g/mol, with the mass and percent of each element. Free and private in your browser.calculator
✦ NewMomentum Calculator: p = m × vSolve momentum, mass or velocity with p = m·v. Choose kg·m/s, N·s or lb·ft/s and see the formula with each step. Free and private, runs in your browser.calculator
✦ NewMorse Code Translator: Text to Morse and Back, With AudioTranslate text to International Morse code and back in your browser, following ITU-R M.1677-1. Choose dot, dash and separator styles, use prosigns, play the code as a tone or flashing light at 5 to 40 WPM, and save a WAV file. Nothing is uploaded.converter
✦ NewMulch CalculatorWork out how much mulch a garden bed needs. Depth starts at 3 inches; get cubic yards, bags of 2 and 3 cubic feet, truck loads, an optional cost, and a table of the area one cubic yard covers at each depth.calculator
✦ NewNumber Base Converter: Binary, Hex, Octal, DecimalConvert whole numbers of any length exactly between binary, octal, decimal, hex and any base from 2 to 36, with BCD, Gray code, negabinary and two's complement. Runs in your browser. Nothing is uploaded.converter
✦ NewNumber List Tools: Sum, Round, Filter, AnalyseApply one operation to a list of numbers: sum, product, running totals, rounding with six modes, truncate, increment, enumerate, join, even and odd, comparison filters, integer analysis, rewrite as a sum, or extract numbers from text. Exact, nothing is uploaded.calculator
✦ NewNumber Sequence Generator: Arithmetic, Geometric & MoreGenerate arithmetic, geometric, even, odd, powers, squares, cubes, look-and-say, Fibonacci-like and linear recurrence sequences, integer pairs and triples, palindromes, zigzags, array literals and set-theoretic ordinals, with the nth-term formula and exact sum. Nothing is uploaded.generator
✦ NewNumber to Words Converter: Numbers to English WordsWrite any number as English words, up to 66 digits, with decimals, an optional British "and", ordinal words or cheque style, and turn number words back into digits. Nothing is uploaded.converter
✦ NewOffice to PDF Converter: Word, Excel, PowerPoint to PDFConvert Word, Excel, PowerPoint and OpenDocument files to PDF. Your file is converted on our EU server in memory, returned to you, and never stored.converter
✦ NewOne Rep Max Calculator: 1RM by 7 Formulas + % TableEstimate your one-rep max from a weight and 1 to 12 reps with the Epley, Brzycki, Lander, Lombardi, Mayhew, O'Conner and Wathan equations side by side, their average, and a 50 to 100 percent training table. Kilograms or pounds. Nothing is sent.calculator
✦ NewOnline Timer and Stopwatch: Countdown, Alarm, LapsA free online timer and stopwatch in one page. Count down from any time with presets and an alarm, or time laps to the hundredth of a second. Keeps time accurately in a background tab.calculator
✦ NewOvulation Calculator: Fertile Window and Ovulation DayEstimate your fertile window, ovulation day and next period for the next six cycles from the first day of your last period, your cycle length and luteal phase. Runs in your browser; nothing is sent.calculator
✦ NewPace Calculator: Running Pace, Time, Distance and SplitsWork out running pace, finishing time or distance from the other two, in km, miles or metres or for a 5K, 10K, half marathon or marathon. Pace per km and mile, km/h and mph, and a split table. Nothing is sent.calculator
✦ NewPaint Calculator: Gallons, Cans and Cost for a RoomWork out how much paint a room needs. Add each wall or the perimeter, subtract doors and windows, set the coats, and get gallons or litres, suggested cans and cost.calculator
✦ NewPascal's Triangle Calculator, Rows 0 to 60, C(n,k)Build Pascal's triangle up to 60 rows with exact numbers, hover any cell to see C(n,k), copy it as text or CSV, and compute a binomial coefficient for n up to 1000.calculator
✦ NewPDF Merger: Combine PDF Files into One, Free and PrivateMerge several PDF files into one document in your browser. Reorder the files, see their page counts and download the merged PDF. Nothing is uploaded.converter
✦ NewPDF Splitter: Split or Extract PDF Pages, Free and PrivateSplit a PDF into single pages, cut it into custom page ranges or extract chosen pages into one file, all in your browser. Nothing is uploaded.converter
✦ NewPhoto Censor: Pixelate, Blur or Hide Part of an ImageHide a face, plate, address or any detail in a photo. Draw rectangles or ellipses, then pixelate, blur or fill each one with a solid colour. Undo, redo and save at full size. Runs in your browser. Nothing is uploaded.image
✦ NewPi Digits Generator: Digits of π, e and Golden RatioGenerate up to 10,000 decimal places of π, e or the golden ratio φ, calculated exactly in your browser, grouped in blocks of 5 or 10, and look up the digit at any place. Nothing is uploaded.generator
✦ NewPixels to PPI Calculator: Pixel Density and Dot PitchCalculate PPI from a resolution and screen diagonal in inches or cm. See dot pitch, total pixels and aspect ratio, or work backwards from PPI to find the resolution.calculator
✦ NewPregnancy Weight Gain Calculator: IOM Guidelines by WeekSee how much weight to gain in pregnancy by the IOM 2009 guidelines, from your pre-pregnancy BMI, for one baby or twins, with the range for your current week and your gain so far. Metric or US units. Nothing is uploaded.calculator
✦ NewPressure Calculator: P = F / ASolve pressure, force or area from the other two. Use Pa, kPa, bar, psi or atm and see the formula P = F / A with each step. Free and private, runs in your browser.calculator
✦ NewPrime Factorization Calculator: Factors and DivisorsWrite any whole number up to 60 digits as a product of prime powers, list all of its divisors with their count and sum, and see the factor tree and closest factor pair. Free and private in your browser.calculator
✦ NewPrime Number Generator: List, Test and Find PrimesList primes between two numbers, get the first n primes, test whether a number up to 2^64 is prime with its smallest factor, or find the n-th prime. Copy or download the list.generator
✦ NewQR Code Generator, Free, No Sign-Up, PrivateMake a QR code in your browser for a link, text, WiFi network, contact card, email, SMS, phone number or map location. Choose size, colours and error correction, add your logo, and download SVG or PNG. Nothing is uploaded.generator
✦ NewRandom Number Generator with PIN Mode, Free and PrivateGenerate random integers or decimals in any range, unique or sorted, one or a thousand at a time, plus random PIN codes. Cryptographically random and never sent anywhere.generator
✦ NewReverse Text: Characters, Words, Lines and FlipReverse text by characters, word order, letters in each word or line order, or flip it upside down, in your browser. Emoji and accents stay intact. Nothing is uploaded.text
✦ NewRoad Base CalculatorEstimate road base, crusher run or crushed stone for a driveway, shed pad or paver bed. Includes a 20 percent compaction allowance, weight at an editable density, truck loads and an optional cost.calculator
✦ NewRoman Numeral Converter: Numbers to Roman and BackConvert numbers to Roman numerals and Roman numerals to numbers, from 1 to 3,999 or up to 3,999,999 with the overline. Strict validation, additive forms, decimal or hex input. Nothing is uploaded.converter
✦ NewRoofing Calculator: Squares, Shingle Bundles and CostEstimate a roof from the building size, overhang and pitch. Get roof area, squares with waste, shingle bundles, underlayment rolls, nails and cost, in feet or metres.calculator
✦ NewRSA Tool: Generate Keys, Encrypt, Decrypt, Sign, VerifyGenerate RSA key pairs as PEM, encrypt and decrypt with RSA-OAEP, and sign or verify with PKCS#1 v1.5 or PSS, all in your browser with the Web Crypto API. Keys never leave your device.generator
✦ NewScientific Notation Converter: E and EngineeringConvert numbers to and from scientific notation, E notation and engineering notation with exact significant-figure rounding, or write them as powers of two with the binary significand and hex float. Free and private in your browser.converter
✦ NewShoe Size Converter: US, UK, EU, Mondopoint and JPConvert shoe sizes for men, women and children between US, UK, EU, Mondopoint and Japanese sizes through the foot length, with full size charts. Brands differ by up to a size. Nothing is uploaded.converter
✦ NewSleep Calculator: Best Bedtime and Wake-Up TimeFind when to go to bed or wake up so you finish a full 90-minute sleep cycle. Allows for the time it takes to fall asleep and shows recommended sleep by age. Runs in your browser; nothing is sent.calculator
✦ NewStair Calculator: Rise, Run, Stringer and AngleLay out a stair from the total rise. Get the number of risers and treads, riser and tread sizes, total run, stringer length and angle, with warnings against residential code limits.calculator
✦ NewSVG Blob Generator, Random Shapes, Free and PrivateDraw a random, smooth SVG blob in your browser. Pick the number of points, contrast, solid or gradient fill and an outline. A seed lets you recreate any shape. Copy the SVG or download SVG and PNG. Nothing is uploaded.generator
✦ NewSVG Pattern Generator, Seamless Backgrounds, FreeMake a seamless SVG background pattern in your browser. Choose dots, stripes, grid, zigzag, waves, hexagons and more, then set size, spacing, rotation, colours and opacity. Copy the CSS or SVG, or download SVG and PNG. Nothing is uploaded.generator
✦ NewSVG Stroke to Fill Converter, Free and PrivateTurn the strokes of an SVG into filled shapes in your browser. Lines, rectangles, circles and paths keep their look with caps, joins and curves outlined. Paste code or open a file. Nothing is uploaded.image
✦ NewSVG to PNG Converter, Free and PrivateConvert SVG files to PNG, JPG or WebP in your browser. Pick a scale from 1× to 8× or an exact width and height, set the background for JPG, convert many at once. Nothing is uploaded.image
✦ NewSyntax Highlighter: Code to HTML with Inline StylesHighlight JavaScript, Python, SQL, HTML, CSS and 13 more languages with auto-detect, then copy self-contained HTML with inline styles in a light or dark theme, or with highlight.js classes. Nothing is uploaded.converter
✦ NewTank Volume CalculatorFind the capacity of a vertical, horizontal, rectangular, capsule, oval or cone-bottom tank, and the volume at any fill height. Results in US gallons, imperial gallons, litres, cubic feet and cubic metres.calculator
✦ NewTarget Heart Rate Calculator: Max HR and Karvonen ZonesFind your maximum heart rate by 220 − age and the Tanaka formula, five training zones by percent of maximum or the Karvonen heart rate reserve method, and the AHA moderate and vigorous bands. Runs in your browser; nothing is sent.calculator
✦ NewText Case Converter: Upper, Lower, Title, camelCaseConvert text to UPPER CASE, lower case, Title Case, Sentence case, camelCase, snake_case, kebab-case and more in your browser. Smart small words, Unicode aware. Nothing is uploaded.text
✦ NewText to Binary, Hex and ASCII Converter, Free and PrivateConvert text to binary, hexadecimal or decimal ASCII codes and back in your browser. UTF-8 aware, any separator, forgiving decoder. Nothing is uploaded.converter
✦ NewTile Calculator: How Many Tiles and Boxes to BuyFind how many tiles and boxes a floor or wall needs. Enter the area, tile size and grout gap to get the tile count with waste, boxes, covered area and cost.calculator
✦ NewTime Calculator: Add and Subtract Hours and MinutesAdd or subtract hours, minutes and seconds, or total a list of durations such as 1:45 + 2:30. Shows the result as h:mm:ss, in decimal hours and in total minutes and seconds.calculator
✦ NewTip Calculator: Split the Bill and TipWork out the tip and split the bill between any number of people. Pick a tip percentage, tip before or after tax and round each share up, then see the tip, total and amount per person.calculator
✦ NewTopsoil CalculatorCalculate topsoil for a lawn, raised bed or garden. Get cubic yards, weight in US tons or tonnes, bags of 0.75, 1, 1.5 cubic feet or 40 lb, truck loads and an optional cost from any mix of units.calculator
✦ NewUnicode Converter: Code Points, UTF-8, UTF-16, EscapesConvert text to and from Unicode code points, binary, octal, decimal or hex numbers, UTF-8, UTF-16 and UTF-32 code units, byte arrays and JavaScript, JSON, Python, C, Java, CSS or HTML escapes, with a per-character breakdown. Nothing is uploaded.converter
✦ NewUnicode Generator: Random Characters, Ranges, Code PointsGenerate random Unicode characters, letters, numbers and text from chosen blocks and scripts, list code point ranges, keep or remove characters by block, and increment or decrement code points. Printable characters only by default. Nothing is uploaded.generator
✦ NewUnicode Normalizer: NFC, NFKC, Fancy Text and HomoglyphsNormalise text to NFC, NFD, NFKC or NFKD with a per-character code point view, turn fancy letters and numbers back into plain ASCII, and spoof, unspoof or detect Cyrillic and Greek homoglyphs. Nothing is uploaded.text
✦ NewUnicode Text Tools: Grapheme-Aware Pad, Reverse, ZalgoPad, centre, chunk, shift, rotate, reverse, repeat, truncate, split, sort and count Unicode text by grapheme, so emoji, flags and accents stay whole. Add strikethrough marks, make Zalgo text or clean it. Nothing is uploaded.text
✦ NewURL Parser: Split a URL and Edit Its Query StringBreak any URL into protocol, host, port, path, query and hash with the browser's own parser. Decode path segments, edit query parameters in a table, resolve relative links and see Punycode hostnames. Nothing is uploaded.converter
✦ NewUSD Inflation Calculator, 1913 to Latest YearFind what a US dollar amount from any year is worth in another year using BLS CPI-U annual averages. See cumulative inflation, the average yearly rate and the CPI values used. Runs in your browser.calculator
✦ NewWeek Number Calculator: ISO and US Week of the YearFind the week number of any date in the ISO 8601 system and the US Sunday-start system, see the dates of that week, and list every week of a year with its start and end.calculator
✦ NewWeight Calculator: W = m × g, Any PlanetFind weight, mass or gravity with W = m·g. Choose Earth, Moon, Mars, Jupiter and more, and see your weight on every planet at once. Free and private in your browser.calculator
✦ NewWhat Is My IP Address? IPv4 and IPv6, Free and PrivateSee your public IPv4 or IPv6 address in one click, plus your browser, operating system, screen size, time zone and language. The address is shown back to you and never stored.converter
✦ NewWhitespace Remover: Extra Spaces and Blank LinesRemove extra spaces, blank lines, tabs and invisible characters from text in your browser. Trim lines, collapse spaces, normalise line endings. Nothing is uploaded.text
✦ NewWork Calculator: W = F × d × cos θSolve work, force, distance or angle with W = F·d·cos θ. Pick joules, kJ, ft·lbf or kWh and see every step of the substitution. Free and private in your browser.calculator
✦ NewXML Formatter and Validator: Beautify or Minify XMLIndent XML with 2 spaces, 4 spaces or tabs, minify it, or check that it is well-formed with line and column errors. Comments, CDATA, namespaces and the declaration are kept. Nothing is uploaded.converter
✦ NewText DiffFind the difference between two texts with character, word, or line precision.converter
✦ NewUnit Price CalculatorCompare unit prices of multiple products to find the best value. Enter price and quantity for up to 3 products to see savings percentages and identify the cheapest option.calculator
✦ NewGolden Ratio CalculatorCalculate the golden ratio proportions. Find the larger part, smaller part, or total length.calculator
✦ NewGPA CalculatorCalculate your Grade Point Average (GPA) based on course credits and letter grades.calculator
✦ NewHourly to Salary CalculatorConvert an hourly wage to an annual salary, or easily find weekly, monthly, and daily rates based on your work schedule.calculator
✦ NewWavelength CalculatorCalculate wavelength, frequency, or velocity of a wave using the wave equation v = λ × f.calculator