Pressure Converter

Written byOleh Soloninupdated 5 October 2026

Value

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Result

Result14.503774

Tyres, gauges and technical datasheets

Convert bar to psi for tyre pressure, kPa for technical specs or mmHg for medical readings. Exact factors for garage and lab alike.

Tyre placards are the most common reason people need this: European cars list bar, American gauges read psi, and the two are not close enough to eyeball.

One bar is 14.5 psi. Getting that backwards is how tyres end up dangerously under-inflated, so the direction of the conversion matters as much as the number.

How to use

Enter a value.
Choose the unit you are converting from: bar, MPa, kgf/cm², atm, psi, kPa, Pa, hPa, mbar, mmHg or metres of water.
Choose the unit you are converting to — the result appears at once.

Tyre pressures: bar and psi

One bar is 14.504 psi. European door-jamb placards give bar, American gauges read psi, and getting the direction wrong leaves a tyre dangerously soft: 2.2 bar is 31.9 psi, not 22.

Every row comes from the calculator on this page.
bar	psi	psi	bar
1	14.5	30	2.07
2	29.01	32	2.21
2.2	31.91	35	2.41
2.5	36.26
3	43.51

Atmospheres, mercury and the older units

A standard atmosphere is 101,325 Pa by definition — 760 mmHg. The kgf/cm², the 'technical atmosphere' still printed on Russian gauges, is 0.980665 bar.

Every row comes from the calculator on this page.
From	To
1 atm	101.325 kPa
1 atm	760 mmHg
1 bar	0.987 atm
1 kgf/cm²	0.980665 bar
1 MPa	10.197 kgf/cm²
120 mmHg	16 kPa
10 m of water	0.980665 bar

What this calculator shows

The converted pressure across pascals, kPa, bar, psi, atmospheres and mmHg
Tyre-friendly bar and psi conversion in both directions
mmHg for blood pressure and vacuum measurements

What to keep in mind

One standard atmosphere is 101,325 Pa by definition.
Tyre gauges read pressure above the surrounding air, not absolute pressure — the placard figure is what you match.

FAQs

How many psi is 2 bar?

29 psi; 2.2 bar is 31.9 psi and 2.5 bar 36.3 psi. The right pressure for your car is on the placard in the door jamb or fuel-filler flap.

How many bar is 32 psi?

2.21 bar. 30 psi is 2.07 bar and 35 psi 2.41 bar.

Is a bar the same as an atmosphere?

Nearly. A bar is 100,000 Pa and an atmosphere 101,325 Pa, about 1.3 percent more. Irrelevant for tyres, relevant when calibrating instruments.

Why is blood pressure measured in mmHg?

The first instruments balanced the pressure against a column of mercury and read its height in millimetres. The mercury has gone; the unit stayed. 120 mmHg is 16 kPa.

What is kgf/cm²?

Kilogram-force per square centimetre, the 'technical atmosphere' still found on Russian and older European gauges. It is 0.980665 bar; one MPa is 10.197 kgf/cm².

Should I check tyres cold or after a drive?

Cold. Driving warms the air inside and raises the pressure, so a hot tyre can read correct when it is not.

Worked example

A European tyre placard

Input: 2.2 bar → psi

Output: 31.9 psi

Note: Round to 32 psi on a garage gauge. Setting 22 psi by mistake would leave the tyre badly under-inflated.

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