Pressure Converter
Convert pressure between psi, bar, pascal, kPa, MPa, atmosphere, torr and inHg instantly, with a reference table.
About the Pressure Converter
This pressure converter switches between the units used in engineering, weather, diving and automotive work: pascals, kilopascals, megapascals, bar, millibar, pounds per square inch, atmospheres, torr (mmHg) and inches of mercury. Enter a value, pick your units, and see the result instantly.
The pascal is the SI unit (one newton per square metre), but real-world pressure is usually quoted in more convenient units — tyre pressure in psi or bar, weather in millibar or inHg, and vacuum in torr. Standard atmospheric pressure ties them together: 1 atm ≈ 101,325 Pa ≈ 14.696 psi ≈ 1.013 bar.
All conversions use exact factors through a pascal base unit and run locally in your browser for fast, precise results.
How to Use the Pressure Converter
- 1Enter the pressure value to convert.
- 2Select the source and target units.
- 3Read the result and reverse conversion instantly.
- 4Use the reference table for common values.
Frequently Asked Questions
How do I convert psi to bar?
Multiply psi by 0.0689476 to get bar, or divide by 14.5038. So 32 psi (a typical tyre pressure) is about 2.2 bar. The tool converts both ways, which is handy since tyre and gauge markings differ between the US and Europe.
What is standard atmospheric pressure?
One standard atmosphere is 101,325 pascals, which equals 1.01325 bar, 14.696 psi, 760 torr (mmHg) or 29.92 inHg. It's the average air pressure at sea level and a common reference point for gauge versus absolute pressure.
What's the difference between gauge and absolute pressure?
Absolute pressure is measured from a perfect vacuum; gauge pressure is measured relative to the surrounding atmosphere. A tyre gauge reading 32 psi (gauge) is about 46.7 psi absolute. This converter changes units, not the reference — keep track of which your value uses.
Why is weather pressure given in millibar or inHg?
Meteorology traditionally uses millibar (equal to the hectopascal) and, in the US, inches of mercury. A typical sea-level reading is around 1013 mb or 29.92 inHg. This tool converts between them and SI units for weather and aviation use.
What is a torr?
One torr is the pressure of one millimetre of mercury, about 133.322 pascals, and 760 torr make one atmosphere. It's widely used for vacuum systems and laboratory work. The converter includes it alongside the everyday units.