MMaxTools

Pressure Converter

Convert bar, psi, kPa, atmospheres, mmHg and more — tire and weather ready.

The Pressure Converter handles the jumble of units used for pressure: bar and millibar, pascals and kilopascals, pounds per square inch (psi), standard atmospheres, and millimeters or inches of mercury. It serves three very different audiences: drivers checking tire pressures (bar in Europe, psi in the US), engineers working in kPa or MPa, and anyone reading barometric weather reports (hPa or inHg).

The unit mix causes real mistakes: a typical car tire wants about 2.2–2.5 bar, which is 32–36 psi — mix up the systems and you could inflate to ten times the correct pressure. Weather pressure of 1,013 hPa is 29.92 inHg or 1 atm, the standard atmosphere defined exactly as 101,325 Pa.

Every conversion uses the exact definition of each unit in pascals, runs locally in your browser, and shows the 1-to-1 rate so you can sanity-check any figure.

Result

1 bar = 14.503773773 psi

1 bar = 14.503773773 psi

1 psi = 0.0689475729317 bar

How to use the Pressure Converter

  1. Type the pressure value.
  2. Select the from-unit (bar, psi, kPa, atm, mmHg, inHg…).
  3. Select the to-unit.
  4. Read the converted value and the exact unit rate.
  5. Swap to convert back, e.g. psi to bar for European gauges.

Frequently asked questions

How do I convert bar to psi?

Multiply bar by 14.5038: 2.5 bar × 14.5038 = 36.26 psi. Tire pressures of about 2.2–2.5 bar therefore correspond to 32–36 psi, and this converter gives the exact figures.

What is standard atmospheric pressure?

1 standard atmosphere is defined as exactly 101,325 Pa — which equals 1.01325 bar, 14.696 psi, 760 mmHg, 29.92 inHg, or 1,013.25 hPa/mbar. Sea-level weather pressure is about 1,013 hPa, falling in storms and rising in high pressure.

Is mmHg the same as torr?

For practical purposes yes: 1 torr was defined as 1/760 of an atmosphere, which differs from 1 mmHg by less than 0.015%. Blood pressure and vacuum measurements are still commonly quoted in mmHg.

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