Pressure Converter
Convert between pascals, kilopascals, bar, PSI, atmospheres and millimeters of mercury instantly — free and private.
Tire gauges read PSI, scuba tanks use bar and weather maps quote hectopascals, and this converter moves between them all without fuss. It uses exact definitions — one PSI is 6,894.757 pascals — so engineering and workshop figures stay precise. Enter a pressure and its equivalents appear live.
1 psi = 6,894.757 Pa exactly; 1 atm = 101,325 Pa.
How to use the Pressure Converter
- Type the pressure you want to convert in the value box.
- Pick the starting unit in the From list and the target unit in the To list.
- The converted pressure appears instantly below — adjust any field to recalculate.
Pressure Converter — FAQs
How many PSI are in 1 bar?
One bar equals 14.5038 PSI. Bar is the metric workshop standard used for tires, compressors and scuba tanks across most of the world, while PSI dominates in the US. This tool uses the exact definition of 1 PSI as 6,894.757293168 pascals for precise conversions.
What is mmHg and where is it used?
Millimeters of mercury measure pressure as the height of a mercury column, dating back to early barometers. It is still the standard for blood pressure readings and vacuum measurements in laboratories, where 760 mmHg equals exactly one standard atmosphere.
Why do weather reports use hectopascals?
Hectopascals are identical to millibars and equal 100 pascals, making them a convenient size for atmospheric pressure around 1,013 hPa. Meteorologists adopted them to keep maps readable, and converting to PSI or inches of mercury is instant with this tool.
Is my data uploaded anywhere?
Your data never leaves your device. This converter runs entirely in your browser using JavaScript, so nothing is uploaded, stored, shared or tracked. It works offline too, and you can use it as often as you like with complete confidence.