Pressure Converter
Convert between bar, psi, pascals, kilopascals, atmospheres, mmHg and other pressure units.
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Pressure units
Every unit below converts to every other one in the calculator. Values are relative to the base unit, the pascal (Pa).
| Unit | Symbol | System | Value |
|---|---|---|---|
| Pascal | Pa | SI | Base unit |
| Hectopascal | hPa | SI | = 100 Pa |
| Kilopascal | kPa | SI | = 1000 Pa |
| Megapascal | MPa | SI | = 1000000 Pa |
| Gigapascal | GPa | SI | = 1000000000 Pa |
| Millibar | mbar | metric | = 100 Pa |
| Bar | bar | metric | = 100000 Pa |
| Standard atmosphere | atm | other | = 101325 Pa |
| Technical atmosphere | at | metric | = 98066.5 Pa |
| Torr | Torr | other | ≈ 133.3223684 Pa |
| Millimeter of mercury | mmHg | other | = 133.322387415 Pa |
| Pound-force per square inch | psi | US customary | ≈ 6894.757293 Pa |
| Kilopound-force per square inch | ksi | US customary | ≈ 6894757.293 Pa |
Pascal quick reference
| Pascal | Kilopascal | Megapascal | Bar |
|---|---|---|---|
| 1 Pa | = 0.001 kPa | = 0.000001 MPa | = 0.00001 bar |
| 10 Pa | = 0.01 kPa | = 0.00001 MPa | = 0.0001 bar |
| 100 Pa | = 0.1 kPa | = 0.0001 MPa | = 0.001 bar |
| 1000 Pa | = 1 kPa | = 0.001 MPa | = 0.01 bar |
Among the 13 pressure units on this page, the smallest is the pascal (Pa) and the largest is the gigapascal (GPa).
More pressure conversions
- Pound-force per square inch to Megapascalpsi → MPa
- Standard atmosphere to Pound-force per square inchatm → psi
- Megapascal to Pound-force per square inchMPa → psi
- Bar to Kilopascalbar → kPa
- Millimeter of mercury to KilopascalmmHg → kPa
- Pound-force per square inch to Standard atmospherepsi → atm
- Bar to Standard atmospherebar → atm
- Kilopascal to BarkPa → bar
- Kilopascal to Millimeter of mercurykPa → mmHg
- Kilopound-force per square inch to Megapascalksi → MPa
- Standard atmosphere to Baratm → bar
- Megapascal to Kilopound-force per square inchMPa → ksi
- Pascal to Pound-force per square inchPa → psi
- Pound-force per square inch to Pascalpsi → Pa
About pressure units
Pressure is force per area. The SI unit is the pascal, one newton per square meter. Because a pascal is small, kilopascals and megapascals are common, and the bar is exactly 100,000 Pa.
The standard atmosphere is exactly 101,325 Pa. Torr is defined as 1/760 of an atmosphere, which is very close to, but not exactly, one millimeter of mercury.
Frequently asked questions
- Does this converter handle psig and psia?
- It converts the numbers but does not change the reference. Gauge pressure (psig) is measured relative to the surrounding air; absolute pressure (psia) is measured from vacuum. Convert 30 psig and you get gauge kilopascals, not absolute.
- Is 1 bar the same as 1 atmosphere?
- Close, but no. 1 bar is 100,000 Pa and 1 standard atmosphere is 101,325 Pa, so 1 atm is exactly 1.01325 bar.
- How many kilopascals are in one pascal?
- One pascal = 0.001 kPa (kilopascals).
- How many megapascals are in one pascal?
- One pascal = 0.000001 MPa (megapascals).
- How many bars are in one pascal?
- One pascal = 0.00001 bar (bars).