Pressure Converter
Convert between PSI, bar, atm, Pa, kPa and mmHg with common references for tyre pressure, atmospheric and blood pressure
All Conversions
PSI
14.70
bar
1.01
atm
1.00
Pa
101353.0
kPa
101.35
mmHg
760.21
Common Pressures
Vacuum
0 PSI
0.00 bar
Atmospheric (sea level)
14.7 PSI
1.01 bar
Tyre pressure (car)
30 PSI
2.07 bar
Tyre pressure (bicycle)
32 PSI
2.21 bar
Compressed air system
50 PSI
3.45 bar
Blood pressure (systolic, high)
120 PSI
8.27 bar
Pressure Gauge
Pressure Units
- PSI: pounds per square inch (common in US/UK)
- bar: SI unit, used in engineering and automotive
- atm: atmospheric pressure at sea level (reference standard)
- Pa/kPa: pascals, SI scientific unit
- mmHg: millimetres of mercury (medical, barometers)
Common Pressure Units
Pressure (force per area) in many units: psi (pounds per square inch), bar, Pa (Pascal, SI base), atm (atmosphere), Torr/mmHg. Convert: 1 atm = 1.013 bar = 14.696 psi = 101,325 Pa = 760 Torr. Each unit suits a context - tyres in psi (US) or bar (EU), barometers in mb/Pa, scuba in atm, blood pressure in mmHg.
Reference: atmospheric at sea level = 1 atm = 1.013 bar = 14.7 psi. Car tyre = 30 psi = 2.07 bar. Bicycle road = 100 psi = 6.9 bar. Espresso = 9 bar = 130 psi. Blood pressure = 120/80 mmHg. Tornado pressure drop = -0.1 bar = -1.5 psi (suction effect).
Common Pressure Conversions
| psi | bar | atm | Pa |
|---|---|---|---|
| 1 | 0.069 | 0.068 | 6,895 |
| 14.7 | 1.013 | 1 | 101,325 |
| 30 | 2.07 | 2.04 | 206,843 |
| 50 | 3.45 | 3.40 | 344,738 |
| 100 | 6.89 | 6.80 | 689,476 |
| 200 | 13.79 | 13.61 | 1,378,951 |
| 500 | 34.47 | 34.02 | 3,447,378 |
| 1000 | 68.95 | 68.05 | 6,894,757 |
Frequently Asked Questions
What's a Pascal?
SI unit of pressure: 1 Pa = 1 N/m² (force per area). Very small unit - atmospheric pressure is 101,325 Pa. Often used as kPa (kilopascals): 101 kPa for atmospheric. Hectopascal (hPa) used in weather: 1013 hPa for sea level (same as 1013 mb).
Why is tyre pressure in different units?
Cultural/regulatory: US uses psi, UK varies (psi or bar), EU bar. Tyre pressure gauges sold for one market may not show both. International equipment usually has both scales. Always check before reading.