Pressure Converter

Convert bar, psi, pascal, atm, and mmHg.

Enter a value, choose the units, and see the result plus every other pressure unit.

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Bar → Pound per square inch

Pressure Converter

Convert pressure between pascals, hectopascals, kilopascals, megapascals, bar, millibar, standard and technical atmospheres, psi, ksi, Torr, millimeters and inches of mercury, and millimeters and inches of water. It covers everything from tire gauges and weather maps to hydraulic systems and vacuum pumps.

Pressure units by field

Field Typical units
Tires and compressors bar, psi, kPa
Weather and aviation hPa, mbar, inHg
Medicine (blood pressure) mmHg
Vacuum technology Torr, mbar, Pa
Engineering and materials MPa, ksi, N/mm² (= MPa)
HVAC ducts and gas lines Pa, mmH₂O, inH₂O

Worked examples

  • Tire pressure: a car manual recommends 2.2 bar. Enter 2.2 with bar selected and you get 220 kPa or about 31.9 psi.
  • Barometer: a weather report of 1013.25 hPa equals 29.92 inHg – the standard altimeter setting pilots use.
  • Blood pressure: 120 mmHg is about 16 kPa.
  • Hydraulics: a 200 bar hydraulic pump works at 20 MPa or about 2,901 psi.

Gauge vs. absolute pressure

Tire and compressor gauges show gauge pressure – the difference from the surrounding air. Absolute pressure adds the atmosphere (about 1.013 bar). This converter changes units only; add or subtract atmospheric pressure yourself if you need to switch between gauge (psig) and absolute (psia) values.

Pressure is force divided by area. To work with the parts separately, use the Force Converter and the Area Converter.

Frequently Asked Questions

1 bar is about 14.504 psi, and 1 psi is about 0.0689 bar. A tire pressure of 2.2 bar is therefore roughly 32 psi.

One standard atmosphere is exactly 101,325 Pa, which equals 1.01325 bar, 1013.25 hPa (millibar), 760 Torr, about 14.696 psi, and about 29.92 inHg.

Yes. One hectopascal equals one millibar (100 Pa). Weather services switched from millibar to hectopascal, but the numbers are identical.

They are nearly identical. One Torr is exactly 1/760 of an atmosphere (133.3224 Pa), while one conventional mmHg is 133.322387415 Pa – a difference of less than one part per million.