Pressure Converter
Converts pressure between engineering, meteorological and medical units. Tyre pressures are usually psi or bar, weather reports use hectopascals or millibars, and blood pressure is still quoted in millimetres of mercury.
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The formula
result = value × (from factor ÷ to factor)
Each pressure unit is defined by its size relative to the pascal, so converting between any two is a single multiplication.
Every pressure unit
| Unit | Symbol | In one pascal |
|---|---|---|
| pascal | Pa | 1 |
| kilopascal | kPa | 0.001 |
| megapascal | MPa | 0.000001 |
| bar | bar | 0.00001 |
| pound per square inch | psi | 0.00014503774 |
| atmosphere | atm | 0.0000098692327 |
| torr | Torr | 0.0075006168 |
| millimetre of mercury | mmHg | 0.0075006158 |
Frequently Asked Questions
How many psi is 1 bar?
14.5038 psi. Bar was chosen to be close to atmospheric pressure, which is 1.01325 bar.
What is standard atmospheric pressure?
101,325 Pa — that is 1,013.25 mbar, 14.696 psi, or 760 mmHg at sea level.
Are millibars and hectopascals the same?
Yes, exactly. 1 mbar = 1 hPa = 100 Pa. Meteorologists switched notation without changing the numbers.