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Pressure converter

Convert bar, psi, and atmospheres without treating mmHg as weather magic.

This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.

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What this tool does

The pascal is the base. A bar is 100,000 Pa. A standard atmosphere is 101325 Pa. Torr is 101325/760 Pa. Inches of mercury use 3386.389 Pa, without a temperature correction.

How to use it

  1. Enter the pressure.
  2. Pick source and destination units.
  3. Convert and copy the JSON.

Supported input

  • A number and two pressure units from the menu

Output

  • JSON with the converted pressure plus every other unit in the family

Privacy

This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.

ConvertPass does not include your input in analytics, URLs, or error reports. Encoding: Decimal numbers / SI pascal. Limit: A single pressure (4.0 KB).

Limitations

  • Gauge versus absolute is your problem. This converts a number, not a reference to vacuum or atmosphere.
  • mmHg equals torr here. Laboratory mercury columns that mention 0 °C are not re-derived.
  • Negative gauge pressures as ‘inches of vacuum’ are not a separate unit.

Example

Input
1 atm → kPa
Output
{
  "result": 101.325,
  "formatted": "1 atm = 101.325 kPa"
}

Troubleshooting

A tyre gauge in bar does not match psi × 14.5
Use this page instead of 14.5. 1 bar is 100 kPa, not exactly 14.5 psi.

FAQ

Is 1 bar the same as 1 atmosphere?

No. 1 bar is 100 kPa. 1 atm is 101.325 kPa.

Are torr and mmHg the same here?

Yes. ConvertPass treats them as 101325/760 Pa.

Does this convert blood pressure?

Only as millimetres of mercury, the number. It is not a medical device.

Can I convert metres of water?

No. Head of water depends on density and gravity. It is not in the menu.

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Last reviewed 16 August 2026. Report a problem. Reports do not include your input.