Pressure Converter: psi, bar, kPa
Convert pressure between psi, bar, kPa, atmospheres, mmHg and more.
Good to know. Air at sea level presses about 1 kg on every square centimetre of you. It pushes back from inside, too.
How it works
In plain words
Convert the pressure into pascals using the exact size of the unit, then into the target unit. One pascal is one newton per square metre; a bar is 100,000 pascals and a psi is about 6,895.
The formula
result = value × (Pa per "from" unit) ÷ (Pa per "to" unit) 1 bar = 100,000 Pa · 1 psi = 6,894.757 Pa · 1 atm = 101,325 Pa
Worked example
32 psi × 6,894.757 = 220,632 Pa, and 220,632 ÷ 100,000 = 2.206322 bar: a typical car tyre.
Sources
- NIST Special Publication 811, Guide for the Use of the International System of Units, Appendix B Exact conversion factors for US customary units.
Sources checked September 30, 2026. 4 automated tests check its answers on every change.
About the pressure converter: psi, bar, kpa
Pressure is measured in many units depending on the country and the job. Tyres are in psi in the US and UK and in bar or kPa in most of Europe and Australia. Weather maps use hectopascals or millibars, which are the same thing. Blood pressure is in millimetres of mercury, and engineering uses megapascals.
The conversions here are exact, from the definitions: a pascal is one newton per square metre, a bar is 100,000 pascals, a standard atmosphere is 101,325 pascals, and a psi, one pound-force on a square inch, is 6,894.757 pascals. So 1 bar is about 14.5 psi, and 1 atmosphere is about 14.7 psi or 1.013 bar.
Tyre pressures are gauge pressures: the pressure above the air around us. A tyre at 32 psi holds about 46.7 psi in absolute terms. Converting between units works the same either way, but don’t mix gauge and absolute values.
Quick references: car tyres usually run at 30 to 36 psi (2.1 to 2.5 bar), bicycle road tyres at 80 to 100 psi (5.5 to 7 bar), and normal air pressure at sea level is about 1,013 hPa.
Questions people ask
How many psi is 1 bar?
About 14.504 psi. To convert bar to psi, multiply by 14.504.
What is 35 psi in bar?
About 2.41 bar.
How do I convert psi to kPa?
Multiply by 6.895. 32 psi is about 220.6 kPa.
Are millibars and hectopascals the same?
Yes. 1 millibar is exactly 1 hectopascal, 100 pascals.