Pressure Unit Converter
Convert between every pressure unit in one place. Pick any two units, see the exact factor and the worked calculation.
How to use it
- Choose the unit you have and the unit you want.
- Type a value — the conversion is instant and shows the working underneath.
- Swap flips the two units. The URL always reflects what you see.
This converter covers every common pressure unit in one page rather than one fixed pair, so you are not hunting for a specific "X to Y" page when the two units you need are not the ones most people search for.
Pick the unit you have, the unit you want, and type a value — the result and the conversion factor both update immediately, worked out to full precision rather than a rounded rule of thumb.
Pressure units on this page
| Unit | Symbol | Notes |
|---|---|---|
| Pascal | Pa | Scientific work. It is a small unit, so kPa is more common in practice. |
| Kilopascal | kPa | Tyre pressures and weather reporting in metric countries. |
| Megapascal | MPa | Material strength and hydraulic systems. |
| Bar | bar | Tyre pressures, diving and industrial equipment in Europe. |
| Millibar | mbar | Weather charts and barometric pressure. |
| Pound per square inch | psi | Tyre pressures, air compressors and plumbing in the US. |
| Standard atmosphere | atm | Chemistry and diving. |
| Torr | Torr | Vacuum systems and laboratory work. |
| Millimeter of mercury | mmHg | Blood pressure and medical measurement. |
A worked example
1 Pa = 0.01 mbar. That factor comes from each unit's fixed relationship to the dimension's base unit — nothing here is approximated or looked up from a rounded table.
Every pairing on this page uses the same approach, so a chain of conversions (say, millimetres to miles) stays accurate rather than compounding rounding error the way repeated approximate factors would.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Last updated 18 August 2026