SpecCalcsReference calculators for the shop floor

Pressure Unit Converter

1 standard atmosphere is exactly 14.696 psi, 1.01325 bar, or 101.325 kPa — enter any value and unit below to see all conversions at once.

Enter a pressure value and select the source unit
Converted values

Conversion formulas

Key equivalences
1  atm=101,325  Pa=14.696  psi=1.01325  bar1\;\text{atm} = 101{,}325\;\text{Pa} = 14.696\;\text{psi} = 1.01325\;\text{bar}
General conversion
Pto=Pfrom×factorfromfactortoP_{\text{to}} = P_{\text{from}} \times \frac{\text{factor}_{\text{from}}}{\text{factor}_{\text{to}}}
factor is the unit's value in pascals (Pa) — the SI base unit of pressure

Every pressure unit is defined by its ratio to the pascal (Pa), the SI unit of pressure (one newton per square metre). To convert from unit A to unit B, multiply by A's pascal factor and divide by B's. The factors used here are the exact values defined by ISO 80000 and NIST, not rounded approximations.

When to use which unit

PSI (pounds per square inch) dominates in US hydraulics, HVAC, and tyre pressure. Bar is the European industrial standard — 1 bar is close to 1 atm, making it intuitive for near-atmospheric work. kPa and MPa are the SI-preferred forms: kPa for weather and ventilation, MPa for material strength and high-pressure systems. atm appears in chemistry and diving. mmHg (torr) is the medical standard for blood pressure. mbar is common in meteorology and vacuum technology. kgf/cm² persists in older Japanese and German specs.