Pressure Converter — PSI to Bar, kPa, Atm & mmHg

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How to use Pressure Converter

Enter the pressure in the “From” field — for example 32 for 32 PSI of tire pressure.
Choose the unit you have (PSI, Bar, Kilopascal, mmHg…) in the first dropdown.
Choose the unit you need in the second dropdown — the converted pressure appears instantly.
Hit the swap button to reverse direction, e.g. bar → PSI becomes PSI → bar.

What is Pressure Converter?

A pressure converter translates pressure readings between units — PSI to bar, atmospheres to kilopascals, or mmHg to hectopascals. The SI unit is the pascal (one newton per square meter), but it is tiny, so real-world figures arrive in kPa, bar (100,000 Pa), PSI (6,894.76 Pa), standard atmospheres (101,325 Pa) or millimeters of mercury (133.32 Pa).

Each unit owns a domain: PSI rules US tire gauges and compressors, bar dominates European gauges and diving, hPa is what weather maps print (1013 hPa is standard sea-level pressure), and mmHg persists in medicine — blood pressure's 120/80 is measured in it.

About the Pressure Converter

This converter covers seven units — pascal, kilopascal, hectopascal, bar, PSI, standard atmosphere and mmHg (Torr) — converting any pair the instant you type.

Everyday jobs: a tire placard saying 32 PSI is 2.21 bar or 221 kPa for a European pump; a scuba tank at 200 bar is 2,900 PSI; a weather reading of 1,020 hPa converts to 30.12 inHg territory (765 mmHg); an autoclave spec of 15 PSI above atmosphere makes sense once you know 1 atm = 14.696 PSI. Anchors: 1 bar ≈ 14.5 PSI, 1 atm = 1.013 bar = 760 mmHg, 1 PSI ≈ 6.9 kPa.

All conversions use exact defined factors and run locally in your browser.

Frequently Asked Questions

One bar is 14.5038 PSI. Handy for tires: 2.2 bar ≈ 32 PSI, 2.5 bar ≈ 36 PSI. One bar is also very close to one atmosphere (0.987 atm).

Standard sea-level pressure is 1 atm = 101.325 kPa = 1013.25 hPa = 1.01325 bar = 14.696 PSI = 760 mmHg. Weather maps use hPa; a strong high reads 1030+, a deep storm below 980.

Early sphygmomanometers used an actual mercury column, and medicine kept the unit. A 120/80 reading means the pressure would lift mercury 120 mm during heartbeats — 120 mmHg is about 16 kPa.

Mostly bar: each 10 m of seawater adds about 1 bar, so a diver at 30 m experiences roughly 4 bar absolute (1 atm surface + 3 bar water) — 58 PSI.

For practical purposes yes — the Torr is defined as 1/760 atmosphere, which differs from the true mmHg by less than 0.000015%. Vacuum engineering says Torr; medicine says mmHg.