PSI Converter

Pounds per square inch is the pressure unit on U.S. tyre gauges, air compressors and hydraulic equipment. Car tyres typically run 30–35 psi and road-bike tyres 80–100 psi.

How to use the PSI Converter

1. Pick the unit you are starting from in the From menu and type your value.
2. Pick the unit you want in the To menu. The heading changes to match, for example “Psi to Bar Converter”.
3. The most common pressure units are shown below at the same time, so you can compare them at a glance.
4. Type into any result to convert backwards, then use Copy results. The copied text starts with the heading for your chosen units.

Results update as you type. Everything is calculated in your browser.

How it works

Each of the 18 pressure units on this page is defined by an exact factor relative to the pascal, the base unit: 1 psi = 6,894.7573 Pa and 1 bar = 100,000 Pa, for example. The calculator first turns the value you type into pascals, then turns that into the unit you picked in the “To” menu and into kilopascals, megapascals and standard atmospheres. Typing into any result works backwards the same way, so the psi and bar values always describe the same amount.

How to convert pressure units

1. Choose the unit you have in the From menu and type the value, for example 32 psi.
2. Choose the unit you want in the To menu, for example bar. The page heading changes to “Psi to Bar Converter”.
3. The calculator multiplies by the pascal factor of the “from” unit and divides by the factor of the “to” unit: 32 psi × 6,894.7573 ÷ 100,000 = 2.2063223 bar.

1 pound per square inch in common units

Psi conversion table

Pressure units explained

Pound per square inch (psi)

Pounds per square inch is the pressure of one pound-force on one square inch, about 6,895 Pa. U.S. tyre gauges, compressors and hydraulic equipment read psi.

Bar (bar)

One bar is exactly 100,000 Pa, close to average atmospheric pressure. European tyre pressures, diving, espresso machines and industrial gauges use bar.

Kilopascal (kPa)

A kilopascal is 1,000 Pa. Tyre pressures in Canada and Australia, weather data and boiler gauges often use kPa; standard air pressure is 101.325 kPa.

Megapascal (MPa)

A megapascal is one million pascals, the same as one newton per square millimetre. Material strengths and hydraulic pressures are given in MPa.

Standard atmosphere (atm)

The standard atmosphere is exactly 101,325 Pa, the average air pressure at sea level. Chemistry problems and diving depth calculations often use atm.

Pascal (Pa)

The pascal is the SI unit of pressure: one newton per square metre. It is small, so kilopascals and megapascals are used in practice.

Kilogram-force per square centimetre (kgf/cm²)

Kilogram-force per square centimetre is an older metric pressure unit still printed on many compressors and gauges; it is 0.980665 bar.

Inch of mercury (inHg)

Inches of mercury are used for barometric pressure in U.S. weather reports and aviation altimeter settings; standard pressure is 29.92 inHg.