Pressure Converter
Convert a pressure reading between bar, psi, kPa, atmospheres and mmHg - handy for tyre pressures, weather charts and dive tables.
About the Pressure Converter
This tool converts a pressure reading between pascals, kilopascals, bar, atmospheres, pounds per square inch (psi), millimetres of mercury (mmHg) and torr. These units appear in very different settings, from car tyres to weather charts to diving and laboratory work.
How to use it
- Enter the value you have into its field, for example a tyre pressure in psi.
- Read the equivalent in bar, kPa or atmospheres.
- Switch to mmHg or torr when working with weather or vacuum measurements.
A common use is matching a tyre placard in bar against a gauge that reads psi, where 1 bar is about 14.5 psi. Note that gauges usually show gauge pressure (above the surrounding air), while atmospheres and pascals can refer to absolute pressure; this converter treats the value as a plain magnitude, so be aware of which reference your source uses. One standard atmosphere equals 101,325 Pa, 1.01325 bar or 760 mmHg. Everything is computed in your browser with nothing uploaded.
Frequently asked questions
How many psi are in 1 bar?
One bar equals about 14.504 psi. So a tyre inflated to 2.2 bar is roughly 32 psi, a typical car figure.
What is standard atmospheric pressure in different units?
One standard atmosphere is 101,325 pascals, which equals 101.325 kPa, 1.01325 bar, 14.696 psi or 760 mmHg.
How do I convert kPa to psi?
Multiply kilopascals by 0.145038. For example, 100 kPa is about 14.5 psi, which is also very close to 1 bar.
What is the difference between gauge and absolute pressure?
Gauge pressure is measured relative to the surrounding atmosphere, so a deflated tyre reads 0. Absolute pressure includes atmospheric pressure. This converter treats your value as a plain number, so check which reference your gauge uses.