Free · Pressure conversions

Bar & Standard Atmosphere Pressure Conversion Calculator

Convert bar & standard atmosphere pressure with editable results and an explained example.

  • Formula & worked example
  • Private in your browser
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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. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

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

Formula and method

1.01325 bar = 1 standard atmosphere. A standard atmosphere is exactly 101,325 pascals; a bar is 100,000 pascals. Keep absolute and gauge pressures on the same reference basis.

1.01325 bar = 1 standard atmosphere

Worked example

Enter these known values and leave the other values blank.

Pressure in bar
1.01325 bar
Pressure in atmospheres
1 atm

Assumptions and limitations

  • A standard atmosphere is exactly 101,325 pascals; a bar is 100,000 pascals. Keep absolute and gauge pressures on the same reference basis.
  • A unit change preserves the quantity. Select the desired unit before entering a new measurement.

Common questions

Which pressure definition does this tool use?

A standard atmosphere is exactly 101,325 pascals; a bar is 100,000 pascals. Keep absolute and gauge pressures on the same reference basis.

Can I solve the conversion in reverse?

Enter the known quantity in its selected unit and leave the unknown quantity blank. Results retain extra precision internally and are rounded for display.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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