Convert between PSI, bar, atm, Pascal, mmHg, and other pressure units instantly.
Tire gauges in the United States read PSI, European door stickers quote bar, weather forecasts use hectopascals, and lab work is done in pascals - the same physical pressure, four different numbers. This converter takes a value in any of the common pressure units and returns its equivalent in the others, so you can compare a reading across gauges and documents without hunting for the conversion factor. The thing most users get wrong: gauge pressure measures above the atmosphere, absolute pressure measures from a vacuum, and this tool converts the number you type without knowing which one it is.
A concrete input and expected output from the current implementation.
Input
32 PSI
Expected output
2.206 bar, 220.6 kPa, 1655 mmHg, 2.18 atm
One PSI is defined as 6894.757 Pa, so 32 PSI is 220,632 Pa. Dividing by 100,000 Pa per bar gives 2.206 bar; dividing instead by 101,325 Pa per atm gives 2.18 atm, and by 133.322 Pa per mmHg gives 1655 mmHg. This is the value a European tire gauge would show as about 2.2 bar.
Every unit this converter supports is a fixed multiple of the pascal, so each conversion is one multiply. PSI becomes pascals by the exact factor 6894.757 Pa, bar by 100,000 Pa, atm by 101,325 Pa. The factors are defined constants, not measurements, so the arithmetic is exact to the last digit the tool shows.
Gauge pressure counts only the pressure above the atmosphere; absolute pressure starts from a vacuum. A tire at 32 PSI gauge sits at roughly 46.7 PSI absolute, because sea-level atmosphere adds 14.696 PSI. The converter cannot see how a reading was taken, so it converts the number as typed; deciding which scale you meant is the user's job.
No. A bar is exactly 100,000 Pa and a standard atmosphere is exactly 101,325 Pa, so 1 bar equals 0.987 atm and 1 atm equals 1.013 bar. The 1.3% gap is invisible in rough work - a 2 bar reading is 1.97 atm - but it matters when comparing exact rated pressures or converting with a formula.
It should: 2.2 bar is about 32 PSI, and both are gauge pressure, measured above atmospheric pressure. If the figures look wildly different, check whether your gauge reads absolute pressure (a few digital models can), and watch the prefix: 2.2 bar is 220 kPa, so a door sticker quoted in kPa will show three digits, not one.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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