Pressure Converter

Enter the pressure value you want to convert.

Select the original unit, such as Pa, bar, kPa, or PSI.

View the equivalent values in all supported units.

Adjust decimal precision to control how many digits appear after the decimal point.

Use the swap control to reverse the selected conversion units.

Copy an individual result using its copy control.

The converter updates the equivalent values when you change the input or selected unit. You can compare several pressure units without calculating each conversion manually.

Convert pressure units online with this free Pressure Converter. Change pascals, kilopascals, megapascals, hectopascals, millibars, bars, PSI, atmospheres, torr, millimetres of mercury, inches of mercury, and kilogram-force per square centimetre.

Enter a pressure value, select its unit, and view the equivalent values in all supported units. Use the converter for measurements related to weather, vehicle tyres, engineering, and science.

Pressure is the amount of force applied to a surface per unit of area. It describes how strongly a force acts over a particular area.

The SI unit of pressure is the pascal (Pa). One pascal is equal to one newton of force applied over one square metre:

1 Pa = 1 N/m²

Different industries use different pressure units. Weather reports commonly use hectopascals (hPa) or millibars (mbar), tyre pressure is often shown in PSI or bar, and engineering applications may use kPa or MPa.

This converter supports twelve pressure units:

Weather and atmospheric pressure

Weather services commonly report atmospheric pressure in hectopascals (hPa) or millibars (mbar). These units have the same numerical value:

1 hPa = 1 mbar = 100 Pa

For example, a pressure reading of 1,013.25 hPa is equivalent to one standard atmosphere.

Actual atmospheric pressure changes with weather and altitude. A standard atmosphere is a reference value, not a promise that the pressure at a particular location is always the same.

Vehicle tyre pressure

Tyre pressure is commonly expressed in PSI or bar. For example, 2.2 bar is approximately 31.91 PSI.

Always follow the vehicle manufacturer's recommended tyre pressure. The correct value depends on the vehicle, tyre, load, and operating conditions.

Engineering and industrial systems

Engineering specifications may use kPa, MPa, bar, or kgf/cm² to describe pressure in pipes, hydraulic equipment, compressors, and other systems.

For example, 1 MPa equals 10 bar. Converting units helps compare specifications, but it does not determine whether a component is safe for a particular pressure.

Science and laboratory measurements

Scientific instruments and experiments may use pascals, torr, or mmHg. These units are useful for describing gas pressure, vacuum conditions, and laboratory measurements.

The values are reference conversions. Small differences may appear depending on rounding and the precise definition used for a unit.

This tool converts a pressure value from one unit to another. It does not measure pressure or adjust the result for real-world atmospheric conditions.

Actual pressure can vary with:

Altitude: Atmospheric pressure generally decreases as altitude increases.

Temperature: Temperature can affect the pressure of a gas in a fixed-volume container.

Weather: Atmospheric pressure changes as weather systems move.

Measurement conditions: Instruments, calibration, and the measurement location can affect a reading.

For example, converting 1 atm to 101.325 kPa is a unit conversion. It does not mean that the atmospheric pressure where you are currently located is 1 atm.

The converter is not a barometer, tyre-pressure gauge, or industrial pressure sensor. Use an appropriate calibrated instrument for actual measurements.