Pressure Converter
This pressure converter changes psi to bar, kPa to psi, atm to Pa, and mmHg to kPa. Use it for tire pressure, barometer readings, blood pressure units, or engineering specs.
| Unit | Value | Copy |
|---|
How to use the Pressure Converter
- Type the Value you want to convert.
- Pick the unit it is in under From, and the unit you want under To. The swap button flips them.
- The answer updates as you type. The table below it shows the same value in every other unit, each with its own copy button.
How it works
1 bar = 100,000 Pa; 1 mbar = 100 Pa (= 1 hPa) 1 atm = 101,325 Pa 1 psi = 1 lbf/in² = 6,894.757 Pa 1 mmHg = 133.322 Pa; 1 Torr = 1/760 atm result = value × from-unit (Pa) ÷ to-unit (Pa)
Examples
- 1 bar = 14.503774 psi.
- 32 psi = 2.206 bar (a typical car tire).
- 1 atm = 101.325 kPa = 760 mmHg.
- 1 psi = 0.068948 bar.
Pound per square inch to bar conversion table
| Pound per square inch (psi) | Bar (bar) |
|---|---|
| 20 psi | 1.378951 bar |
| 26 psi | 1.792637 bar |
| 28 psi | 1.930532 bar |
| 30 psi | 2.068427 bar |
| 32 psi | 2.206322 bar |
| 33 psi | 2.27527 bar |
| 35 psi | 2.413165 bar |
| 36 psi | 2.482113 bar |
| 40 psi | 2.757903 bar |
| 100 psi | 6.894757 bar |
Car tires are usually 30 to 35 psi (about 2.1 to 2.4 bar). Check the label inside the driver's door.
Bar to pound per square inch conversion table
| Bar (bar) | Pound per square inch (psi) |
|---|---|
| 0.5 bar | 7.251887 psi |
| 1 bar | 14.503774 psi |
| 1.5 bar | 21.755661 psi |
| 2 bar | 29.007548 psi |
| 2.2 bar | 31.908302 psi |
| 2.5 bar | 36.259434 psi |
| 3 bar | 43.511321 psi |
| 5 bar | 72.518869 psi |
| 10 bar | 145.037738 psi |
| 200 bar | 2,900.754755 psi |
Pressure units and their size in pascals
| Unit | Symbol | Equals |
|---|---|---|
| Pascal | Pa | 1 Pa |
| Kilopascal | kPa | 1,000 Pa |
| Megapascal | MPa | 1,000,000 Pa |
| Bar | bar | 100,000 Pa |
| Millibar | mbar | 100 Pa |
| Standard atmosphere | atm | 101,325 Pa |
| Pound per square inch | psi | 6,894.757293 Pa |
| Millimeter of mercury | mmHg | 133.322387 Pa |
| Inch of mercury | inHg | 3,386.389 Pa |
| Torr | Torr | 133.322368 Pa |
Gauge pressure and absolute pressure
A tire gauge reads the pressure above the surrounding air (gauge pressure). A barometer reads the total pressure (absolute pressure). They differ by about 1 atm at sea level. This converter changes units only; it doesn't add or remove atmospheric pressure, so a gauge reading stays a gauge reading.
Limitations
- Converts units only, not between gauge and absolute pressure.
- mmHg and inHg use the conventional values at 0 °C and standard gravity.
Frequently asked questions
How do I convert psi to bar?
Multiply by 0.0689476, or divide by 14.5038. For example, 32 psi is about 2.21 bar.
What is 1 atm in kPa?
One standard atmosphere is exactly 101.325 kPa, or 1.01325 bar.
Are mmHg and torr the same?
Almost. 1 Torr is 1/760 of an atmosphere (133.3224 Pa) and 1 mmHg is 133.3224 Pa; they differ by less than one part in a million.