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Pressure Converter

Convert between pascals, kilopascals, bar, PSI and atmospheres.

Pressure Converter

Professional grade conversion for pressure units.

Pascal
Select Unit
0.001
Kilopascal
Select Unit

Conversion Formula

1 Pascal ≈ 0.001 Kilopascal

What Pressure Converter does

Pressure is force spread over an area, and the unit you meet depends on the field: pascals in science, bar in European engineering, PSI in American engineering and tyre gauges, atmospheres in chemistry and diving.

The pascal is small, so everyday pressures are quoted in kilopascals or bar: standard atmospheric pressure is about 101.3 kilopascals, or 1.013 bar.

  • Pascal and kilopascal
  • Bar, PSI and standard atmosphere

How to use Pressure Converter

  1. 1

    Enter the value

    Type the amount you want to convert. The result updates as you type.

  2. 2

    Select the units

    Choose what your value is in and what you want it in, for example bar to PSI.

  3. 3

    Copy the result

    The copy button gives you the unformatted number, without thousands separators, ready to paste into a spreadsheet or code.

Limits and known behaviour

  • Gauge pressure and absolute pressure are different quantities. A tyre gauge reads pressure above the surrounding air, so a reading of 32 PSI is about 46.7 PSI absolute. This tool converts numbers and cannot know which convention your reading uses.
  • Millimetres of mercury and inches of mercury, used in medicine and in weather reporting, are not included.
  • Arithmetic uses double-precision floating point, so a converted value can end in a small representation residue. That is a property of binary arithmetic, not of the conversion factor.

Privacy and data handling

Runs entirely in your browser

  • The conversion is arithmetic performed in this page. Nothing you enter is transmitted or stored.
  • The tool works offline once the page has loaded.

Site-wide data handling, including analytics and advertising, is described in the privacy policy.

Frequently asked questions

Is my tyre pressure gauge reading absolute pressure?

No, it reads gauge pressure — the amount above atmospheric. That is why a completely flat tyre reads zero rather than about 14.7 PSI.

Is bar the same as an atmosphere?

Almost, but not exactly. One bar is 100,000 pascals while one standard atmosphere is 101,325, so an atmosphere is about 1.3% larger.