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Torr, Atmospheres & Metric Pressure Comparison

Torr, Atmospheres & Metric Pressure Comparison with editable units, inverse inputs and a worked example.

  • Formula & worked example
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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

760 torr equals one standard atmosphere, 101,325 Pa or 101.325 kN/m². The optional water-column units follow conventional density and standard gravity.

One torr = 101,325 ÷ 760 Pa; conventional cmH₂O = 98.0665 Pa

Worked example

Enter these known values and leave the other values blank.

Pressure A
760 Torr
Pressure B
1 atm
Pressure C
101325 Pa
Pressure D
14.696 psi
Pressure E
101.33 kN/m²

Assumptions and limitations

  • All fields express the same pressure quantity. Unit conversion preserves its reference: absolute, gauge or differential. It does not add or subtract local atmospheric pressure.
  • Zero and signed values are supported for mathematical or differential-pressure comparisons. Negative absolute pressure is outside the physical meaning of these units.
  • Standard atmosphere means exactly 101,325 Pa; technical atmosphere means 98,066.5 Pa. PSI and force-per-area units use standard gravity, 9.80665 m/s², with international length and mass definitions.
  • The retained mmHg convention is 133.322387415 Pa, distinct from a torr (101,325/760 Pa). Optional inHg retains the captured approximate 3,386.39 Pa factor. These manometer conversions are not a temperature-dependent liquid-column simulation.
  • Where present, water-column units are conventional: 9.80665 Pa per mmH₂O and 98.0665 Pa per cmH₂O. A metric tonne-force is 1,000 kg-force. Display rounding does not establish measurement accuracy.

Common questions

What relationship does this comparison use?

760 torr equals one standard atmosphere, 101,325 Pa or 101.325 kN/m². The optional water-column units follow conventional density and standard gravity.

Does changing units turn gauge pressure into absolute pressure?

No. This conversion keeps the same pressure reference. Gauge-to-absolute conversion requires adding the applicable ambient pressure separately.

Can I calculate in the opposite direction?

Yes. Enter a known value in any field and leave the others blank. Read the selected unit beside each value, since every comparison field can use a different unit.

References

Pounds-force per square inch use the exact international pound and inch with standard gravity, replacing the rounded captured factor. Pounds-force per square foot use the exact international pound and foot with standard gravity. Conventional water-column units use standard gravity and the conventional 1000 kg/m³ water density; they do not simulate a physical column at a measured temperature.

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