Pascal to psi Converter

To convert a pressure in pascals to pounds per square inch, divide by 6,894.757. To go the other way, multiply.

One pascal is 0.000145037744 psi, so a pascal is a very small unit of pressure — a single pascal is roughly the pressure a sheet of paper exerts lying flat on a table. Pressures you meet in daily life are usually quoted in kilopascals (kPa) or bars instead.

Convert 200,000 Pa (a typical car tyre pressure) to psi:

And in reverse, a 32 psi tyre:

• Standard atmosphere — 101,325 Pa = 14.6959 psi. This is sea-level air pressure by definition.
• Car tyre — 200,000–250,000 Pa = 29–36 psi.
• Bicycle road tyre — 620,000–830,000 Pa = 90–120 psi.
• Mains water supply — 300,000–500,000 Pa = 44–73 psi.
• Espresso machine — 900,000 Pa = 131 psi, the classic "9 bar" extraction pressure.
• Scuba tank, full — 20,000,000 Pa = 2,900 psi.

The pascal (Pa) is the SI unit of pressure: one newton of force spread over one square metre, or $1 \text{ Pa} = 1 \text{ N/m}^2$. It is named after Blaise Pascal and is the unit used in science, engineering and most weather reporting outside the United States. Because it is small, it almost always appears with a prefix: 1 kPa = 1,000 Pa, and 1 bar = 100,000 Pa exactly.

Psi stands for pounds per square inch — the force in pounds-force spread over one square inch. It is the customary pressure unit in the United States, and it survives worldwide in tyre pressures, compressed-air equipment and plumbing. One psi is defined through exact base units: one pound-force is 4.448222 N and one square inch is 0.00064516 m², which gives 6,894.757 Pa.

You will also see psig and psia. Psig is gauge pressure, measured relative to the surrounding air; psia is absolute pressure, measured from a vacuum. A tyre gauge reads psig, so a tyre at 32 psig holds about 46.7 psia.

How many psi is 1 pascal? 0.000145037744 psi. Pascals are far smaller than psi, so the number shrinks sharply.

How many pascals is 1 psi? 6,894.757 Pa, or about 6.895 kPa.

What is 1 bar in psi? A bar is 100,000 Pa, which is 14.5038 psi.

What is atmospheric pressure in psi? Standard atmosphere is 101,325 Pa, or 14.6959 psi — commonly rounded to 14.7 psi.

Why is the factor 6,894.757 and not a round number? Because the pascal comes from metric base units and psi from imperial ones. The pound-force and the inch are each defined exactly in SI terms, so the ratio between the two pressure units is an exact but untidy number.

Conversions are powered by the extremely fast and precise open-source convert.js library.