6XC

Pressure Converter (bar, psi, MPa)

Convert between bar, psi, MPa, kPa, atm and mmHg instantly — all values shown at once.

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Pressure Units at a Glance

All conversions go through the pascal: 1 bar = 100,000 Pa = 14.504 psi = 0.1 MPa; 1 atm = 101,325 Pa = 1.013 bar; 1 mmHg (Torr) = 133.322 Pa. Enter a value in any unit and every other unit updates.

Field rules of thumb: tire pressures live in psi/bar (32 psi ≈ 2.2 bar), hydraulics in bar/MPa (200 bar = 20 MPa ≈ 2900 psi), weather in hPa (=mbar), medicine in mmHg. US spec sheets are psi; European drawings are bar or MPa — the ~14.5× gap between psi and bar is the classic unit mix-up.

Frequently Asked Questions

Is psi the same as psig?

psig is gauge pressure (relative to the atmosphere, what a tire gauge reads); psia is absolute (gauge + ~14.7 psi). This tool converts magnitudes; whether the value is gauge or absolute stays your bookkeeping.

What is the difference between bar and atm?

Nearly nothing in practice: 1 atm = 1.01325 bar. The bar was defined as a round 100 kPa; the atmosphere is the historical mean sea-level pressure.

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