How do I convert bar to psi, atm to Pa, mmHg to kPa?
Pressure units converter - pascal (Pa), hectopascal (hPa), kilopascal (kPa), megapascal (MPa), bar, millibar (mbar), atmosphere (atm), psi, torr, mm Hg, inch Hg, mm H₂O.
Type a value - see all the others live.
Perfect for car tires (psi ↔ bar), weather forecast (hPa, mbar), HVAC (Pa, kPa), physics (atm ↔ Pa), medicine (mmHg).
Everything computed locally.
How to use it
- Type a value on the left and pick the source unit.
- On the right you see all the others live - bar, psi, kPa, atm, mmHg etc.
- Click any result = copies the value to clipboard.
- Works both ways - change the source unit and the value re-converts automatically.
When this is useful
The most common uses:
- Car tires - manufacturer specs 2.2 bar, but the gas station gauge is in psi? 2.2 bar ≈ 32 psi.
- Weather forecast - low pressure = ~990 hPa, high = ~1030 hPa. Standard atmospheric pressure = 1013.25 hPa = 1 atm.
- HVAC and AC - service technicians use kPa, Pa, bar, psi interchangeably depending on country.
- Physics and chemistry - atm for gas-law equations (PV = nRT), Pa in SI, bar in engineering.
- Medicine - blood pressure in mmHg ("120/80 mmHg"). Standard since the 19th century (mercury manometer).
- Diving - bar for depth (10 m of water = 1 bar extra). A 200-bar tank is standard.
Questions and answers
2.2 bar = 31.9 psi (~32 psi). 1 bar = 14.504 psi. European car makers spec in bar, US gauges in psi. Typical car tire pressure: 2.0-2.5 bar = 29-36 psi.