Pressure Converter
Type a pressure in any unit and see it in all 20 at once: psi, bar, kPa, MPa, atm, kgf/cm², mmHg, inches of mercury, inches of water and more. Switch between gauge and absolute pressure, read the tire pressure chart, or work out the pressure at a water depth and the air pressure and boiling point at an altitude.
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How to use it
- Type the pressure and choose its unit, such as psi or bar.
- Say whether it is a gauge reading or an absolute pressure.
- Read the main result and the same pressure in every other unit.
- Use the depth or altitude tab to work out pressure under water or up a mountain.
Why use this tool
20 units at once
psi, bar, kPa, MPa, atm, kgf/cm², mmHg, Torr, inHg, inches and feet of water, psf, ksi and more.
Gauge and absolute
See the matching absolute pressure for a gauge reading, or the gauge value for an absolute one.
Tire pressure chart
Common tire pressures from 26 to 50 psi in bar and kPa.
Pressure under water
Fresh water, seawater or any liquid by density, for diving, tanks and pumps.
Altitude and boiling point
Standard air pressure at any height up to 36,000 ft and the temperature where water boils.
Exact factors
Uses the defined values: 1 psi = 6,894.757 Pa, 1 atm = 101,325 Pa, 1 bar = 100,000 Pa.
Pressure conversion factors
| 1 unit | kPa | psi | bar |
|---|---|---|---|
| 1 psi | 6.895 | 1 | 0.06895 |
| 1 bar | 100 | 14.504 | 1 |
| 1 atm | 101.325 | 14.696 | 1.01325 |
| 1 kgf/cm² | 98.0665 | 14.223 | 0.980665 |
| 1 inHg | 3.386 | 0.4912 | 0.03386 |
| 1 mmHg | 0.1333 | 0.01934 | 0.001333 |
| 1 inH₂O | 0.2491 | 0.03613 | 0.002491 |
PSI to bar for tires
Divide psi by 14.504 to get bar, or multiply bar by 14.504 to get psi. Most passenger cars run 30 to 35 psi, which is 2.1 to 2.4 bar or about 210 to 240 kPa. Check pressures when the tires are cold, because a tire warmed by driving reads 2 to 4 psi higher.
Pressure also changes with the weather: a tire loses about 1 psi for every 10 °F (5.6 °C) drop in temperature, which is why the low-pressure warning often comes on during the first cold morning of autumn.
Gauge pressure vs absolute pressure
A tire gauge, a compressor dial and a water pressure gauge read zero when they are open to the air. That is gauge pressure, sometimes written psig. Absolute pressure, psia, counts from a perfect vacuum, so it includes the 14.7 psi of the atmosphere at sea level.
Weather reports, altimeters, vacuum pumps and engineering tables use absolute pressure. A tire at 32 psig is at about 46.7 psia.
mmHg, inHg and inches of water
Blood pressure is measured in millimeters of mercury: 120/80 mmHg is 16.0/10.7 kPa. US weather reports and aircraft altimeters use inches of mercury, with 29.92 inHg as standard sea-level pressure. Inches of water are used for small pressures such as furnace draft, duct static pressure and gas lines: residential natural gas is typically supplied at about 7 inches of water, a quarter of a psi.
Frequently asked questions
How many psi is 1 bar?
1 bar is 14.504 psi. To convert bar to psi, multiply by 14.504; for psi to bar, divide by 14.504.
What is 32 psi in bar?
32 psi is 2.21 bar or 221 kPa, a typical cold pressure for a passenger car tire.
Is kgf/cm² the same as bar?
Almost. 1 kgf/cm² is 0.981 bar, so the two differ by about 2%. Older gauges in Japan, Russia and India often use kgf/cm².
What is standard atmospheric pressure?
101,325 Pa, which equals 1 atm, 1.01325 bar, 14.696 psi, 760 mmHg or 29.92 inHg.
How much does pressure increase under water?
About 1 atmosphere for every 10 meters (33 feet) of seawater. At 30 meters a diver is at 4 atmospheres absolute.
What does psig mean?
Pounds per square inch gauge: pressure above the surrounding air. Add about 14.7 to get psia, the absolute pressure.
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