Pressure Unit Converter

Convert between 22+ pressure units: Pascal, bar, psi, atm, torr, mmHg, mmH₂O, kgf/cm², and more.

1 atm (Pa) 1 atm 1 bar 1 atm (psi) 1 atm (mmHg) 1 bar (Pa) 1 kgf/cm²
Equivalent Pressures 1 Pa

Click any value to set it as input.

Understanding Pressure Units

Pressure is defined as force per unit area. The SI unit is the pascal (Pa), equal to one newton per square metre. Due to the wide range of pressures encountered in engineering, meteorology, medicine, and industry, many different units are in common use.

1 Pa = 1 N/m²

1 bar = 100,000 Pa (approximately atmospheric pressure)

? Common pressure units and their conversion to pascal
Unit Symbol Conversion to Pa Typical use
Pascal Pa 1 SI unit, science
Kilopascal kPa 1000 Engineering, tyre pressure
Megapascal MPa 1,000,000 Material strength, hydraulics
Bar bar 100,000 Meteorology, industrial
Millibar mbar 100 Weather maps
Standard atmosphere atm 101,325 Chemistry, physics
Torr torr 133.322 Vacuum measurement
Pound per square inch psi 6894.76 US customary, tyres
Pound per square foot psf 47.8803 Construction (US)
Millimetre of mercury mmHg 133.322 Blood pressure, meteorology
Inch of mercury inHg 3386.39 Aviation, refrigeration
Millimetre of water mmH₂O 9.80665 Low pressures, ventilation
Centimetre of water cmH₂O 98.0665 Medical (CVP), hydraulics
Metre of water mH₂O 9806.65 Hydrostatic pressure
Kilogram-force per cm² kgf/cm² 98,066.5 Older metric, hydraulics
Dyne per square centimetre dyn/cm² 0.1 CGS system, physics
? Practical examples
  • Standard sea‑level atmospheric pressure: 101.325 kPa = 1.01325 bar = 14.6959 psi = 760 mmHg.
  • Typical car tyre pressure: 220 kPa ≈ 2.2 bar ≈ 32 psi.
  • Blood pressure of 120/80 mmHg corresponds to about 16 kPa / 10.7 kPa.
  • Water pressure increases by 9.81 kPa per metre of depth (1 mH₂O ≈ 9.81 kPa).
? Frequently Asked Questions

1 bar is exactly 100,000 Pa, while 1 standard atmosphere (atm) is defined as 101,325 Pa. They are very close: 1 atm ≈ 1.01325 bar.

Multiply psi by 6.89476 to get kPa. For a quick estimate, multiply by 6.9.

They are nearly identical: 1 torr = 1/760 atm = 133.3223684 Pa, while 1 mmHg at 0 °C is defined as 133.322 Pa. For practical purposes they are the same.