Converter hub
Pressure Converter
Pressure conversions appear in tyres, weather, diving and engineering. The pascal is the SI unit; bar, atm, psi and mmHg are the working units in each field. Pick a pair below or open the page for the exact factor, a worked example and a full chart.
Units in this category
Pressure conversions appear in tyres, weather, diving and engineering. The pascal is the SI unit; bar, atm, psi and mmHg are the working units in each field.
| Unit | Symbol | Definition |
|---|---|---|
| Kilopascals | kPa | A kilopascal is 1,000 pascals and is common in weather and engineering. |
| Bar | bar | One bar is exactly 100,000 pascals, slightly below standard atmosphere. |
| Atmospheres | atm | Standard atmosphere is exactly 101,325 pascals. |
| PSI | psi | One pound per square inch is about 6,894.76 pascals. |
| mmHg | mmHg | One millimetre of mercury is about 133.322 pascals and is used in medicine. |
All pressure conversions
Every listed pair has its own page with the formula, examples and a chart. Choose the starting unit:
Kilopascals (kPa)
Atmospheres (atm)
mmHg (mmHg)
Frequently asked questions
How many pressure units are supported?
5 units, which gives 8 one-way conversions.
Are the factors exact?
They follow SI and international definitions. Where a unit is approximate by nature (for example Mach, months or fuel economy), the page says so.
Can I convert in both directions?
Yes. Every pair page has a swap link and the calculator accepts any decimal value.