🔵 Pressure Converter
Convert between Pascal, Kilopascal, Bar, Atmosphere, PSI, mmHg, and inHg instantly.
Quick Reference
How to Convert Pressure Units
Pressure is defined as force per unit area. This converter works by converting every input to the base unit (Pascal), then to the target unit. Pressure measurement is critical in weather forecasting, tyre maintenance, medical readings, and engineering.
Common Conversion Factors
| From | To | Multiply by |
|---|---|---|
| Atmosphere | Pascal | 101,325 |
| Bar | Pascal | 100,000 |
| PSI | Pascal | 6,894.757 |
| mmHg | Pascal | 133.322 |
| inHg | Pascal | 3,386.39 |
| Kilopascal | Pascal | 1,000 |
| PSI | Bar | 0.0689476 |
Pressure in Everyday Life
Tire pressure is typically measured in PSI (32–35 PSI for cars) or bar (2.2–2.4 bar). Blood pressure is measured in mmHg — a normal reading is around 120/80 mmHg. Weather reports use millibars (hPa) or inHg; standard sea-level pressure is 1013.25 hPa or 29.92 inHg.
Pressure Quick Reference
| atm | kPa | PSI | bar | mmHg |
|---|---|---|---|---|
| 0.5 | 50.66 | 7.35 | 0.507 | 380 |
| 1 | 101.33 | 14.70 | 1.013 | 760 |
| 2 | 202.65 | 29.39 | 2.027 | 1520 |
| 5 | 506.63 | 73.48 | 5.066 | 3800 |
| 10 | 1013.25 | 146.96 | 10.133 | 7600 |
Frequently Asked Questions
Standard atmospheric pressure is the pressure exerted by Earth's atmosphere at sea level, defined as 101,325 Pascals (101.325 kPa). It equals 1 atm, 14.696 PSI, 760 mmHg, or 29.92 inHg. It decreases with altitude — roughly halving every 5,500 metres.
PSI stands for pounds per square inch. It measures how much force (in pounds) is applied per square inch of area. 1 PSI ≈ 6,894.76 Pascals. It is commonly used in the US and UK for tire pressure, compressed gas cylinders, and hydraulic systems.
A Pascal (Pa) is the SI unit of pressure, equal to one newton of force per square metre. Named after Blaise Pascal, it is a very small unit — atmospheric pressure is about 101,325 Pa. That's why kilopascals (kPa) and bars are more commonly used in everyday applications.
A mercury barometer measures atmospheric pressure by balancing the weight of a mercury column against the atmosphere. At sea level, mercury rises to about 760 mm (29.92 inches). Modern aneroid barometers use a sealed metal capsule that expands or contracts as pressure changes, driving a needle on a dial.