psi to Bar Converter

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Convert pounds per square inch to bar at the rate 1 psi ≈ 0.06895 bar. The most common context is tire pressure: 30 psi ≈ 2.07 bar, 32 psi ≈ 2.21 bar (a typical car tire), 40 psi ≈ 2.76 bar, 100 psi ≈ 6.89 bar (high-pressure bike tire). Useful when reading US-style pressure ratings on hydraulic equipment, scuba tanks or compressors. Browser-local conversion.

Pound per square inch (psi)
Bar

Pound per square inch (psi) → Bar

Quick reference table

Pound per square inch (psi)Bar
15 psi1.0342 bar
20 psi1.379 bar
25 psi1.7237 bar
30 psi2.0684 bar
32 psi2.2063 bar
35 psi2.4132 bar
40 psi2.7579 bar
50 psi3.4474 bar
100 psi6.8948 bar

Glossary

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).

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.

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

Bar to psi
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