Pressure converter — bar, psi, pascal and atmospheres

Tyre pressures in psi or bar, weather charts in hectopascals, blood pressure in mmHg, process lines in MPa — ten pressure units that rarely appear together anywhere else.

How to use it

1
Type into any row — say bar or psi. The results appear immediately, no button needed.
2
Need a combined figure? Fill in two rows, for example bar and kPa, and they are added together before converting.
3
Set how many digits you want (4–12) and click a result to copy the plain number.

Exact conversion factors

These are the definitions the calculator uses. Nothing here is rounded for convenience — where a value is exact by definition, it says so.

1 bar = 100 000 Pa = 100 kPa = 14.5037738 psi
1 atm = 101 325 Pa exactly = 1.01325 bar = 14.6959488 psi = 760 Torr (759.99989 mmHg)
1 psi = 6894.757293168 Pa = 0.0689475729 bar
1 mmHg = 133.322387415 Pa · 1 inHg = 3386.388640341 Pa
1 hPa = 1 mbar — identical sizes

FormulaPa = bar × 100 000 · psi = bar × 14.5037738 · Pa = psi × 6894.757293 · atm = Pa ÷ 101 325

Pressure conversion table — every unit

One of each unit, converted into the three units people ask for most.

Unit	bar	psi	kPa
1 MPa	10 bar	145.038 psi	1 000 kPa
1 kPa	0.01 bar	0.145038 psi	1 kPa
1 Pa	0.00001 bar	0.000145038 psi	0.001 kPa
1 bar	1 bar	14.5038 psi	100 kPa
1 mbar	0.001 bar	0.0145038 psi	0.1 kPa
1 atm	1.01325 bar	14.6959 psi	101.325 kPa
1 psi	0.0689476 bar	1 psi	6.89476 kPa
1 kgf/cm²	0.980665 bar	14.2233 psi	98.0665 kPa
1 mmHg	0.00133322 bar	0.0193368 psi	0.133322 kPa
1 inHg	0.0338639 bar	0.491154 psi	3.38639 kPa

bar → psi, kPa — quick values

bar	psi	kPa
0.5 bar	7.25189 psi	50 kPa
1 bar	14.5038 psi	100 kPa
2 bar	29.0075 psi	200 kPa
3 bar	43.5113 psi	300 kPa
5 bar	72.5189 psi	500 kPa
10 bar	145.038 psi	1 000 kPa
20 bar	290.075 psi	2 000 kPa
25 bar	362.594 psi	2 500 kPa
50 bar	725.189 psi	5 000 kPa
100 bar	1 450.38 psi	10 000 kPa
250 bar	3 625.94 psi	25 000 kPa
1 000 bar	14 503.8 psi	100 000 kPa

How this converter works

Two numbers cover most everyday work: 1 bar is 14.5 psi, and standard atmospheric pressure is 1013.25 mbar or 14.7 psi. A car tyre at 2.2 bar is sitting at 31.9 psi, which is why both scales appear on garage gauges.

Everything on the page is gauge-independent — it converts the number you type, not the reference it was measured against. If your source reads in absolute pressure (bara, psia) and your target expects gauge (barg, psig), subtract one atmosphere before or after converting; the converter cannot know which you meant.

Notes and abbreviations

1 bar = 100 kPa = 14.504 psi
1 atm = 101.325 kPa = 760 mmHg = 14.696 psi
mbar and hPa are the same size — weather maps use them interchangeably

Questions

What tyre pressure is 32 psi in bar?

2.2063 bar. Going back, 2.5 bar is 36.2594 psi.

Are hPa and mbar the same?

Yes, exactly. A reading of 1013 hPa and 1013 mbar describe identical pressure.

Does this handle absolute versus gauge pressure?

It converts magnitudes only. For gauge to absolute, add 1.01325 bar yourself.