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Pressure in Bar, PSI, Atmospheres & Pascals

One bar equals 100,000 pascals. One standard atmosphere equals 1.01325 bar. Select compatible units to convert or solve from an entered equivalent quantity.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

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Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

One bar equals 100,000 pascals. One standard atmosphere equals 1.01325 bar.

1 bar = 100,000 Pa; 1 standard atmosphere = 101,325 Pa

Worked example

Enter these known values and leave the other values blank.

Pressure in bar
1 bar
Pressure in pounds per square inch
14.50377 psi
Pressure in atmospheres
0.986923 atm
Pressure in pascals
100000 Pa
Other pressure units
0.987 atm

Assumptions and limitations

  • Arithmetic uses 64 significant decimal digits. Displayed values are rounded separately.
  • Each field represents the same quantity in its selected units; enter one known value to calculate its equivalents.
  • Conversion preserves the supplied pressure basis. Converting units does not add or remove atmospheric pressure when switching between gauge and absolute pressure.
  • The standard atmosphere is a defined constant. Actual local atmospheric pressure varies. Signed values may represent gauge pressure or pressure differences.

Common questions

Does converting gauge PSI to pascals make it absolute pressure?

The unit changes while the same gauge reference remains. Absolute pressure requires separately accounting for the reference atmospheric pressure.

References

Mercury pressure columns use conventional density and standard gravity, with the exact international inch. Pounds-force per square inch use the exact international pound and inch with standard gravity, replacing the rounded captured factor. One technical atmosphere is exactly one kilogram-force per square centimeter under standard gravity.

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