Pressure converter
Type a pressure, choose the units, and see the result and the same pressure in every common unit. The standard atmosphere, bar and psi have exact definitions in pascals.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Type a number. A dot or a comma works as the decimal separator.
- Choose the unit you have and the unit you need. The ⇄ button swaps them.
- The table below shows the same pressure in all common units at once.
Conversion factors
Every unit is converted through the pascal (one newton per square meter).
| Unit |
In pascals |
| 1 kilopascal (kPa) |
1,000 Pa |
| 1 millibar (hPa) |
100 Pa |
| 1 bar |
100,000 Pa |
| 1 psi (pound-force per square inch) |
6,894.757293168 Pa |
| 1 standard atmosphere (atm) |
101,325 Pa |
| 1 Torr = 1/760 atm |
133.3224 Pa |
| 1 mmHg (conventional) |
133.322387415 Pa |
The psi value comes from the pound (0.45359237 kg), standard gravity (9.80665 m/s²) and the inch (0.0254 m): 0.45359237 × 9.80665 ÷ 0.0254².
Worked example
A tyre should be at 2.4 bar. In psi that is 240,000 ÷ 6,894.757 = 34.8 psi. A weather report of 1013 mbar equals 101.3 kPa, or 29.91 inHg.
Quick reference
- 1 bar = 100 kPa ≈ 14.504 psi
- 1 psi ≈ 6.895 kPa ≈ 0.0689 bar
- 1 atm ≈ 1.01325 bar ≈ 14.696 psi
- 1 inHg ≈ 3.386 kPa
Frequently asked questions
How many psi is 1 bar?
About 14.5038 psi. A bar is exactly 100,000 Pa and a psi is 6,894.757293168 Pa.
How many kPa is 32 psi?
32 psi × 6.894757 = 220.6 kPa. Tyre pressures are quoted in psi, bar or kPa depending on the country.
What is standard atmospheric pressure?
1 atm = 101,325 Pa = 1.01325 bar = 760 Torr = 14.6959 psi.
Is mmHg the same as Torr?
They are nearly the same: 1 Torr is exactly 1/760 of an atmosphere (133.3224 Pa), and conventional mmHg is 133.322387415 Pa. They differ by about 0.00001%, so the difference never matters in practice.
Is psi gauge or absolute?
The unit is neither. Gauge pressure is measured relative to the surrounding air, absolute pressure relative to vacuum; this tool converts the number only and does not add or subtract atmospheric pressure.