Pressure Converter

Compare pressure units used for tires, weather, engineering, laboratories and medicine.

How pressure converter works

Values are normalized through pascals. One standard atmosphere is exactly 101,325 pascals.

Example formula: atmospheres × 101,325 = pascals

Accurate, private conversion

The conversion engine uses standardized constants and keeps calculation precision separate from display formatting. Your entered values stay in this browser and are not added to the URL or sent to the server.

Frequently asked questions

Are torr and mmHg identical?

They are extremely close but have distinct modern definitions, so this converter keeps them separate.

How many PSI are in one atmosphere?

One standard atmosphere is approximately 14.6959 PSI.