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Convert pressure.
PSI to bar and kPa for tyres, millibars for the weather, millimetres of mercury for blood pressure.
Pressure
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13 units
Common pressure conversions
Each of these has its own page with the formula, a values table and both directions.
Every pressure unit on this page
- pascal Pa
- The SI base unit of pressure, defined as one newton per square metre. The standard unit in physics and engineering.
- kilopascal kPa
- A thousand pascals, and the unit weather services and atmospheric measurements use worldwide.
- megapascal MPa
- A million pascals, used for material strength testing and high-pressure industrial applications.
- hectopascal hPa
- A hundred pascals, identical to the millibar. Weather forecasts and aircraft altimetry.
- bar bar
- Roughly equal to atmospheric pressure at sea level, and the unit used in pressure gauges and industrial equipment.
- millibar mbar
- A thousandth of a bar, identical to the hectopascal. The everyday unit in weather forecasting.
- standard atmosphere atm
- The average atmospheric pressure at sea level, used as a reference point for high-pressure industrial work.
- torr Torr
- One-seventh-hundredth of standard atmospheric pressure, used in vacuum work and precise scientific measurements.
- millimeter of mercury mmHg
- The pressure exerted by a one-millimetre column of mercury, used in medical equipment and scientific instruments.
- inch of mercury inHg
- The pressure exerted by a one-inch column of mercury, the unit weather reports use in the United States.
- pound per square inch psi
- Pounds per square inch, the everyday unit for tyre pressure, boiler safety ratings and industrial pressure gauges.
- kilopound per square inch ksi
- Thousands of pounds per square inch, used in structural engineering and material strength specifications.
- kilogram-force per square centimeter kgf/cm²
- The metric unit of pressure still used in older engineering work and technical specifications.
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