Bar to psi Converter

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Convert bar to pounds per square inch at the rate 1 bar ≈ 14.504 psi. Common tire-pressure context: 2 bar ≈ 29.0 psi, 2.5 bar ≈ 36.3 psi (typical European spec), 3 bar ≈ 43.5 psi. Engineering: a 250-bar hydraulic system runs at 3,626 psi. Useful when European pressure ratings need translating into US/automotive psi. Browser-local conversion.

Bar
Pound per square inch (psi)

Bar → Pound per square inch (psi)

Quick reference table

BarPound per square inch (psi)
1 bar14.5038 psi
1.5 bar21.7557 psi
2 bar29.0075 psi
2.5 bar36.2594 psi
3 bar43.5113 psi
4 bar58.0151 psi
5 bar72.5189 psi
7 bar101.5264 psi
10 bar145.0377 psi

Glossary

Bar

The bar is a non-SI metric pressure unit equal to exactly 100,000 Pa, very close to atmospheric pressure at sea level (1 atm = 1.01325 bar). Widely used in European engineering, automotive specs (turbo boost, fuel-rail pressure), tire pressure (2–3 bar typical), scuba diving and weather charts. Not part of SI but accepted for use with SI.

Pound per square inch (psi)

A pound-force per square inch equals 6,894.76 Pa. It is the dominant pressure unit in US automotive and engineering: tire pressure (32 psi = 2.21 bar), hydraulic systems (1,000–3,000 psi), bicycle tires (60–120 psi), municipal water (60 psi typical). Standard atmospheric pressure is 14.696 psi. The unit is sometimes split as psi-g (gauge, above atmospheric) and psi-a (absolute).

Metric / SI pressure

In the metric system, pressure is reported in pascals (SI base) or its multiples — kilopascal (kPa, 10³ Pa), megapascal (MPa, 10⁶ Pa) — and the related non-SI unit bar (10⁵ Pa). The millibar/hectopascal (mbar = hPa = 100 Pa) is used in meteorology. All metric units relate by exact powers of ten, so conversions between them are simple shifts of decimal point.

Imperial / US pressure

US engineering and automotive primarily report pressure in pounds per square inch (psi). 1 psi ≈ 6,894.76 Pa, defined as one pound-force per square inch. Standard atmospheric pressure is 14.696 psi. The closely related "psi-gauge" (psi-g) measures pressure above atmospheric, while "psi-absolute" (psi-a) measures total pressure including atmospheric.

Related tools

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