Convert pressure units instantly. This free pressure converter switches between Pa, kPa, bar, atm, psi, mmHg, inHg and millibars from any starting unit, all routed through pascals for accuracy.
Convert from
Enter a pressure and choose its unit. All other units update instantly — conversions go through pascals (Pa), the SI unit of pressure.
Converted
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Enter a pressure
atm
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psi
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bar
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kPa
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Pa
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mbar / hPa
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mmHg
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inHg
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Standard atmospheric pressure is 1 atm = 101,325 Pa = 1.01325 bar = 14.696 psi = 760 mmHg. Pressure is force per unit area; all these units measure the same thing in different scales.
Use this free pressure converter to switch between pascals, kPa, bar, atm, psi, mmHg, inHg and millibars. Enter a value in any unit and all the others update instantly.
What this pressure converter does
A pressure converter changes a pressure between common units. They all measure force per unit area; the calculator converts through pascals (Pa), the SI unit, so every result is consistent.
Common pressure conversions
Unit
In pascals (Pa)
1 atm
101,325
1 bar
100,000
1 psi
6,894.76
1 kPa
1,000
1 mmHg (torr)
133.322
1 inHg
3,386.39
So 1 atm = 14.696 psi = 1.01325 bar = 760 mmHg, and a tyre at 32 psi is about 2.21 bar.
Where each unit is used
psi is common for tyres and US engineering; bar and kPa in much of the world; atm in chemistry; mmHg and inHg in weather and blood pressure; millibars (hPa) in meteorology.
How to use the pressure converter
Enter a pressure value.
Choose the unit you’re starting from.
Read every other unit instantly.
Pressure Converter FAQ
How do I convert psi to bar?
Multiply psi by 0.0689 (since 1 psi = 6894.76 Pa and 1 bar = 100,000 Pa). So 32 psi is about 2.21 bar.
How do I convert bar to psi?
Multiply bar by 14.5038. So 1 bar is about 14.5 psi and 2 bar is about 29 psi.
What is 1 atm in psi and bar?
Standard atmospheric pressure is 1 atm = 14.696 psi = 1.01325 bar = 101,325 Pa = 760 mmHg.
How do I convert kPa to psi?
Multiply kPa by 0.145. So 100 kPa is about 14.5 psi.
What's the difference between mbar and hPa?
None — they're identical. 1 millibar equals 1 hectopascal (100 Pa), which is why weather reports use them interchangeably.
Is the pressure converter free?
Yes, this pressure converter is completely free, needs no sign-up, and gives instant results in your browser.
