Pressure Converter
Runs locally in your browser. Nothing leaves your device.Instantly convert pressure between pascals, kPa, MPa, bar, psi, atmospheres, torr, mercury and water-column units.
Use a comma or period as the decimal separator; do not use thousands separators.
All units
SI and bar
Atmospheres and technical units
Mercury and vacuum
Water column
Imperial and US customary
How it works
- 1
Enter value and source unit
Enter the pressure value and choose the source unit from one of the five groups.
- 2
Choose the target unit
Choose the target unit, even from a different group.
- 3
Copy the result or swap units
Copy one or all results, or swap the source and target unit for the next conversion.
Good to know
The pressure converter converts directly in your browser between SI/bar, atmospheres and technical units, Anglo-American units, mercury/vacuum units, and water column. All results are calculated via a common Pascal base, with transparent definitions such as 1 bar = 100,000 Pa and 1 atm = 101,325 Pa.
Calculation runs locally in the browser. Important: the unit alone does not distinguish between absolute, relative, and differential pressure — the tool keeps the reference type unchanged and does not, for example, automatically convert bar(g) to bar(a). Torr and mmHg are also nearly but not exactly identical.
Typical use cases
Convert tire pressure and everyday values
Convert bar to psi or pascal to bar, for example for tire pressure, household appliances, or simple technical specifications.
Convert technical pressure figures with the correct reference
Check on data sheets and system specifications whether absolute, relative, or differential pressure is meant before converting the unit — the tool doesn't change the reference type automatically.
Convert vacuum and mercury units
Convert Torr or mmHg into other pressure units, for example for lab, vacuum, or older medical readings.
Tips for better results
Don't confuse reference type with the unit
The unit alone doesn't say whether it's absolute, relative, or differential pressure — the tool doesn't, for example, automatically convert bar(g) to bar(a).
Don't treat Torr and mmHg as exactly identical
Both units are nearly but not exactly the same size — for high-precision applications, it's worth checking the exact definitions.
Features
Five unit groups
SI and bar, atmospheres and technical units, Anglo-American, mercury and vacuum, and water column.
Local conversion
Calculation happens directly in the browser, without transmission to a server.
Transparent definitions and reference-type notice
Shows exact conversion definitions and explicitly notes that the reference type stays unchanged.
Frequently asked questions
Does the tool convert between absolute and relative pressure?
No. The tool keeps the reference type unchanged; the unit alone does not distinguish between absolute, relative, and differential pressure.
Are Torr and mmHg identical?
Nearly, but not exactly — the two units differ by a very small amount.
Are my inputs uploaded?
No. Conversion runs entirely locally in the browser.
More tools
Looking for another tool?
Every tool runs locally in your browser – no sign-up, no upload, and it works offline.