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Guide

How to Convert Between Pressure Units (bar, psi, pascal, atm)

Learn the common pressure units, how they relate, and how to convert between them for engineering and everyday use.

Open the Pressure Converter

A pressure converter translates values between pascal, hectopascal, kilopascal, megapascal, bar, millibar, atmosphere, psi, and torr. Pressure units are numerous because different fields adopted different references.

Common pressure units

  • Pascal (Pa) — the SI unit; 1 Pa = 1 N/m².
  • Bar — 1 bar = 100,000 Pa, close to 1 atmosphere.
  • psi — pounds per square inch; common in tyres and US engineering.
  • atm — standard atmosphere = 101,325 Pa.
  • torr / mmHg — 1/760 of an atm; used in medicine and vacuum work.

Key conversion factors

  • 1 bar = 14.5038 psi = 100,000 Pa.
  • 1 atm = 1.01325 bar = 14.696 psi = 760 torr.
  • 1 psi = 6,894.76 Pa = 0.0689476 bar.
  • 1 hPa = 100 Pa = 1 mbar.

How to use the converter

  1. Enter a value and choose its unit.
  2. Choose the target unit.
  3. Read the converted pressure.

Examples

A car tyre at 32 psi is about 2.21 bar or 220,632 Pa. Standard atmospheric pressure is 1013.25 hPa (the figure in weather forecasts). A vacuum of 0.01 atm is about 7.6 torr.

When a pressure converter is useful

  • Checking tyre pressures across unit systems.
  • Reading weather forecasts (hPa/mbar).
  • Engineering specs that mix metric and imperial.
  • Medical and scientific pressure figures.

Put it into practice

Use the Pressure Converter right now — free, in your browser, no sign-up required.

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