Volume Converter

About the Volume Converter

The Volume Converter turns a volume written in one unit into the same volume written in another — litres to gallons for fuel, millilitres to fluid ounces for a bottle, or cups, tablespoons and teaspoons for a recipe. All of the imperial-looking units here are US measures. Type a number, pick the two units, and the answer updates as you type.

How to convert litres to US gallons

One US liquid gallon is exactly 3.785411784 litres. The figure is exact because the US gallon is defined as 231 cubic inches, and the inch is exactly 2.54 cm.

$$\begin{aligned} \text{gallons} &= \text{litres} \div 3.785411784 \\ \text{litres} &= \text{gallons} \times 3.785411784 \end{aligned}$$

Worked example. A 50-litre fuel tank holds 50 ÷ 3.785411784 = 13.21 US gallons. Going the other way, a 15-gallon tank holds 15 × 3.785411784 = 56.78 litres.

Litres to US gallons conversion table

US cooking measures in millilitres

• 1 US gallon = 3,785.412 mL = 4 quarts.
• 1 US quart = 946.3529 mL = 2 pints = 4 cups.
• 1 US pint = 473.1765 mL.
• 1 US cup = 236.5882 mL = 8 fluid ounces = 16 tablespoons.
• 1 US fluid ounce = 29.57353 mL.
• 1 US tablespoon = 14.78676 mL = 3 teaspoons.
• 1 US teaspoon = 4.928922 mL.

Real-world values

• A 330 mL soft drink can is 11.16 US fluid ounces.
• A 750 mL wine bottle is 25.36 US fluid ounces, or 3.17 cups.
• A 2-litre bottle is 0.528 US gallons.
• A standard bathtub holding 150 litres is 39.6 US gallons.
• One cubic metre is exactly 1,000 litres, which is 264.17 US gallons.
• An Olympic pool of 2,500 m³ holds 2,500,000 litres.

US gallons are not imperial gallons

This is the trap worth knowing. A US liquid gallon is 3.785412 L, while the imperial gallon still used in the UK is 4.54609 L — about 20 percent larger. The same gap runs through the quart, pint and fluid ounce. This converter offers the US measures only, which is why every label above says US. A UK recipe calling for a pint needs 568 mL, not the 473 mL this tool gives.

What is a litre?

A litre is 1,000 cubic centimetres, which is one thousandth of a cubic metre. It is not an SI base unit — the cubic metre is — but it is accepted for use with SI and is the unit most of the world buys liquids in. One litre of fresh water has a mass very close to one kilogram, which is where the original definition came from.

Units this converter supports

Ten: millilitre, litre, cubic metre, and the US gallon, quart, pint, cup, fluid ounce, tablespoon and teaspoon. Any pair converts in either direction. Imperial gallons, pints and fluid ounces are not offered, and neither are dry measures such as the bushel.

Frequently asked questions

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