Pressure Unit Converter

Convert between Pa, kPa, MPa, bar, mbar, atm, PSI and mmHg instantly.

Instant result Runs in browser

Tip: Enter a value in any field and all other units update automatically.

Reference values

PabaratmPSImmHg
Standard atmosphere 101 3251.013114.696760
Sea level air pressure 101 3251.013114.696760
Car tire pressure 220 0002.2 2.1731.91650
Normal blood pressure (systolic) 15 999 0.1600.1582.32120
10 m water depth pressure 198 6501.99 1.9628.81490

Formulas

1 atm = 101 325 Pa
1 bar = 100 000 Pa
1 PSI = 6 894.757 Pa
1 mmHg = 133.322 Pa
1 kPa = 1 000 Pa
1 MPa = 1 000 000 Pa
1 mbar = 100 Pa

How to use?

  1. 1
    Enter a value Type your pressure value in any unit field; all other units update instantly.
  2. 2
    Read the result All units update simultaneously. No Calculate button needed.
  3. 3
    Copy or share Use the Copy button to copy all results to the clipboard, or share the page link.

FAQ

What is the difference between Pascal and bar?
1 bar = 100,000 Pascal (Pa). Although bar is not an SI unit, it is widely used in meteorology and industry. 1 standard atmosphere ≈ 1.01325 bar.
What is PSI and where is it used?
PSI (pound per square inch) is a pressure unit used in the imperial system, common for tire pressure, gas cylinders, and hydraulic systems. 1 PSI ≈ 6894.76 Pa ≈ 0.0689 bar.
How does mmHg relate to blood pressure?
mmHg (millimeter of mercury) is the standard unit for blood pressure in medicine. Normal blood pressure is expressed as 120/80 mmHg, which equals about 16,000 Pa or 0.16 bar.

What Are Pressure Units?

Pressure is force per unit area. The SI base unit is the Pascal (Pa), equal to 1 Newton per square metre. Different fields use different units depending on the scale and tradition.

Common Pressure Units and Their Uses

  • Pascal (Pa) / kPa / MPa: SI standard for science and engineering. 1 kPa = 1,000 Pa; 1 MPa = 1,000,000 Pa.
  • Bar / mbar: Widely used in meteorology and industry. 1 bar = 100,000 Pa ≈ 1 atm. Weather forecasts use mbar (hectopascal).
  • Atmosphere (atm): Standard atmospheric pressure at sea level; 1 atm = 101,325 Pa = 760 mmHg.
  • PSI (lb/in²): Used in the US for tires, gas cylinders, and hydraulics. 1 PSI ≈ 6,895 Pa.
  • mmHg (Torr): Medical standard for blood pressure and vacuum measurements. 1 mmHg = 133.322 Pa.

Practical Reference Values

Car tires: 2.0–2.5 bar (29–36 PSI). Sea level air: 1013 mbar. Recreational diving limit: 40 m (5 atm). Industrial steam lines: 6–16 bar.

Comments