Convert pressure units instantly. This free pressure converter switches between Pa, kPa, bar, atm, psi, mmHg, inHg and millibars from any starting unit, all routed through pascals for accuracy.
Enter a pressure and choose its unit. All other units update instantly – conversions go through pascals (Pa), the SI unit of pressure.
Standard atmospheric pressure is 1 atm = 101,325 Pa = 1.01325 bar = 14.696 psi = 760 mmHg. Pressure is force per unit area; all these units measure the same thing in different scales.
How the Pressure Converter Works
This tool converts a pressure value between eight common units at once — pascals, kilopascals, bar, atmospheres, psi, mmHg, inHg, and millibars — by routing every conversion through pascals for accuracy.
Formula: Value in Pa = input value × (unit’s conversion factor to Pa). Every other unit is then found by dividing that Pa value by its own factor. Factors used: 1 atm = 101,325 Pa, 1 psi = 6,894.757293 Pa, 1 bar = 100,000 Pa, 1 kPa = 1,000 Pa, 1 mbar/hPa = 100 Pa, 1 mmHg = 133.322368 Pa, 1 inHg = 3,386.389 Pa.
- Pressure value — the number you want to convert
- From unit — the unit that value is currently in: atm, psi, bar, kPa, Pa, mbar/hPa, mmHg, or inHg
Example Scenarios
| Value | From Unit | Pascals (Pa) |
|---|---|---|
| 1 | atm | 101,325 Pa |
| 100 | psi | 689,475.73 Pa |
| 1 | bar | 100,000 Pa |
| 5 | kPa | 5,000 Pa |
| 760 | mmHg | 101,325 Pa |
| 10 | mbar | 1,000 Pa |
Pressure Converter FAQ
How many pascals are in 1 atmosphere?
This converter uses 101,325 Pa for 1 standard atmosphere (atm), which is also the reference value it uses to derive its psi, bar, mmHg, and inHg conversion factors.How do I convert psi to bar?
Enter your pressure value, set the From unit dropdown to psi, and read the Bar figure directly from the results grid — it updates instantly alongside all seven other units.What’s the difference between mmHg and inHg?
Both measure pressure as a column of mercury, just in different length units. This converter treats 1 mmHg as 133.322368 Pa and 1 inHg as 3,386.389 Pa — inHg is larger because an inch is longer than a millimetre.Is mbar the same as hPa?
Yes, numerically. One millibar equals one hectopascal (1 mbar = 1 hPa = 100 Pa), which is why this converter lists them together as a single combined unit.What reference value does this converter use for standard atmosphere?
It uses the internationally recognized standard atmosphere, 101,325 Pa (equal to 1.01325 bar or 14.696 psi), as the basis for its atm conversions.Can I convert into a unit other than the eight listed?
Not directly — this converter is limited to Pa, kPa, bar, atm, psi, mmHg, inHg, and mbar/hPa. For a unit outside that list, you’d need to convert manually using its known relationship to one of these.Related Calculators
Pressure and mass often go hand in hand with other physical quantities — check a material’s mass-per-volume with the density calculator, work out the force behind a given mass and acceleration with the force calculator, or see how outdoor conditions feel with the wind chill calculator.