About the Pressure Converter
Convert pressure units for tires, weather, diving and engineering: psi, bar, kPa, atm and mmHg.
Key features
- Convert Pa, kPa, bar, psi, atm and mmHg
- Tire, weather, scuba and blood pressure units
- Exact defined factors (1 atm = 101,325 Pa)
- Swap direction with one click
- See the value in every unit at once
- Free, instant, no sign-up
Pressure unit conversion
Pressure shows up in car tires, bike pumps, weather reports, scuba gear, HVAC systems, hydraulics and medicine, each with its own preferred unit. This converter switches between them instantly.
Common conversions
| From | To | Multiply by |
|---|---|---|
| Bar | psi | 14.5038 |
| psi | Bar | 0.0689476 |
| kPa | psi | 0.145038 |
| psi | kPa | 6.89476 |
| atm | kPa | 101.325 |
| mmHg | kPa | 0.133322 |
Tire pressure reference
| psi | bar | kPa |
|---|---|---|
| 28 | 1.93 | 193 |
| 30 | 2.07 | 207 |
| 32 | 2.21 | 221 |
| 35 | 2.41 | 241 |
| 40 | 2.76 | 276 |
Always use the pressure printed on your vehicle's door sticker or in the manual, not the maximum on the tire sidewall.
Where each unit is used
- psi: tires and air compressors in the US.
- bar: tires in Europe, scuba tanks, espresso machines.
- kPa: tires in Canada and Australia, engineering.
- hPa (= mbar): weather maps; 1013 hPa is average sea-level pressure.
- mmHg: blood pressure and vacuum measurements.
Related converters
Convert other engineering units with the Energy Converter or the Unit Converter.
How to use the Pressure Converter
- Enter your numbers in the fields above. Units and options can be changed at any time.
- The result updates instantly as you type; there's no calculate button to press.
- Check the breakdown under the main result for the details behind the number.
- Adjust the inputs to compare scenarios, for example a different rate or term.