Pressure Converter
Convert pressure between PSI, bar, Pascal, atmosphere, mmHg, inHg, and more.
Pressure Unit Reference
| Unit | Pascals | PSI | atm |
|---|---|---|---|
| 1 Pascal | 1 | 0.000145 | 0.00000987 |
| 1 kPa | 1,000 | 0.145 | 0.00987 |
| 1 bar | 100,000 | 14.504 | 0.9869 |
| 1 atm | 101,325 | 14.696 | 1 |
| 1 psi | 6,894.76 | 1 | 0.068 |
| 1 mmHg | 133.322 | 0.01934 | 0.001316 |
Frequently Asked Questions
What is a Pascal?
The Pascal (Pa) is the SI unit of pressure, defined as one Newton per square metre. It is a relatively small unit — standard atmospheric pressure at sea level is about 101,325 Pa. Kilopascals (kPa) and megapascals (MPa) are used when dealing with higher pressures.
What is standard atmospheric pressure?
Standard atmospheric pressure (1 atm) is defined as exactly 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.696 psi = 760 mmHg = 29.92 inHg. This is approximately the atmospheric pressure at sea level on Earth.
What is the difference between gauge pressure and absolute pressure?
Absolute pressure is measured relative to a perfect vacuum. Gauge pressure is measured relative to atmospheric pressure. A car tire inflated to 32 psi is 32 psi gauge — absolute pressure inside is 32 + 14.7 = 46.7 psi. This calculator converts between absolute pressure units.
What pressure is used for car tires?
Most passenger car tires are inflated to 30–35 psi gauge (207–241 kPa gauge). The recommended pressure is on a label inside the driver's door or in the owner's manual — not on the tire sidewall, which shows the maximum pressure.
What is blood pressure measured in?
Blood pressure is measured in millimetres of mercury (mmHg). Normal blood pressure is below 120 mmHg systolic and 80 mmHg diastolic, written as 120/80 mmHg. These values correspond to about 16 kPa and 10.7 kPa respectively.