Pressure psi ↔ bar

1 bar = 14.5038 psi = 100 kPa = 0.987 atm.

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How to use this calculator

  • Pick direction + enter value.
  • Read all common units.

About this calculator

Pressure unit conversions: 1 bar = 14.5038 psi = 100 kPa = 0.987 atm = 750 mmHg. Atmospheric pressure at sea level: ~14.7 psi = 1.013 bar = 101.325 kPa = 1 atm. Tire pressure: ~32 psi = 2.2 bar. Scuba tanks: 3000 psi = 207 bar. Industry uses bar/Pa (SI) or psi (US).

Frequently asked

Bar vs. atm?+
Bar is metric (100 kPa exactly). atm is sea-level standard pressure (101.325 kPa). Very close but not identical.
Gauge vs. absolute?+
PSIG (gauge): zeroed at atmospheric. PSIA (absolute): zeroed at vacuum. PSIA = PSIG + 14.7.
Tire pressure?+
Vehicles spec PSI (US) or bar (Europe). 32 psi cold tire = 2.2 bar.
Pascal?+
1 Pa = 1 N/m² (SI base). Tiny — atmospheric is 101,325 Pa. Usually use kPa or bar in practice.
mmHg?+
Millimeters of mercury. Used in medicine (blood pressure). 760 mmHg = 1 atm.

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