Bar to Psi (bar to psi)
One bar is 14.5038 psi, so 2.5 bar is 36.26 psi and 10 bar is 145.04 psi. Kilopascals and atmospheres are shown too.
1 bar =
14.5 psi
- Exact
- 14.503773773 psi
- kilopascals
- 100 kPa
- standard atmospheres
- 0.9869 atm
pounds per square inch ≈ bars × 14.5037738
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How to convert bar to psi
Multiply the bar by 14.5038:
psi = bar × 14.5038
2.5 bar × 14.5038 = 36.26 psi. A bar is exactly 100,000 pascals; a psi is one pound-force per square inch, 6,894.757 pascals, based on the pound and standard gravity. The result also shows kilopascals and atmospheres. To go the other way, divide psi by 14.5038.
Bar to psi chart
| Bars (bar) | Pounds per square inch (psi) |
|---|---|
| 0.5 bar | 7.252 psi |
| 1 bar | 14.5 psi |
| 1.5 bar | 21.76 psi |
| 2 bar | 29.01 psi |
| 2.2 bar | 31.91 psi |
| 2.5 bar | 36.26 psi |
| 3 bar | 43.51 psi |
| 4 bar | 58.02 psi |
| 5 bar | 72.52 psi |
| 7 bar | 101.53 psi |
| 9 bar | 130.53 psi |
| 10 bar | 145.04 psi |
| 15 bar | 217.56 psi |
| 20 bar | 290.08 psi |
| 100 bar | 1,450.38 psi |
| 200 bar | 2,900.75 psi |
| 300 bar | 4,351.13 psi |
Tires, espresso and scuba
| Use | bar | psi |
|---|---|---|
| Car tire | 2.2–2.5 bar | 32–36 psi |
| Road bike tire | 5–7 bar | 73–102 psi |
| Espresso brewing | 9 bar | 130.5 psi |
| Pressure washer | 100–200 bar | 1,450–2,900 psi |
| Scuba tank, full | 200–232 bar | 2,900–3,365 psi |
European cars print tire pressures in bar (and kPa) on the door jamb; U.S. pumps read psi. The right pressure is the one on the vehicle’s placard, not the maximum on the tire sidewall. Espresso machines advertise 15 or 19 bar pump pressure, but the brewing pressure at the coffee is around 9 bar.
Gauge and absolute pressure
Tire and compressor gauges show pressure above the surrounding air. Engineers write psig for gauge pressure and psia for absolute pressure, which includes the atmosphere’s 14.7 psi; in bar the same idea is “bar(g)” and “bar(a)”. A tire at 2.2 bar on the gauge is at about 3.2 bar absolute. This converter changes units only, so convert gauge to gauge and absolute to absolute.
Reading a European car manual
Manuals for cars built for Europe give tire pressure in bar or kPa, speed in km/h and fuel in liters. Converting all three at once helps when you import a car or drive a rental abroad: 2.3 bar is 33 psi, 130 km/h is 81 mph in the km/h to mph converter, and a 50-liter tank is 13.2 gallons with liters to gallons. Tire pressure also falls about 1 psi for every 10 °F drop in air temperature, so check it again when the weather turns cold.
Bar, kPa and atmospheres
One bar is 100 kPa, about the air pressure at sea level; one standard atmosphere is 101.325 kPa, or 1.01325 bar. Weather maps use millibars or hectopascals — the same thing — so standard air pressure is 1,013 mbar. For other units on the same page, see the result lines; for temperature conversions that often appear beside pressure in specs, see Celsius to Fahrenheit.