ToolWren › Pressure

Pressure Converter

Convert pressure between pascals, bar, psi, atmospheres and mmHg — for tyres, weather, diving and engineering.

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How to use the Pressure

Enter the number you want to convert in the Value field.
Pick the unit you're converting From and the unit you want To.
Read the converted result, or use ⇅ to swap the two units.
Check the All units table to see your value expressed in every supported unit at once.

Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.

About Pressure

Common pressure units

Pascals (SI), bar and atmospheres (weather, diving), psi (tyres, US engineering) and mmHg/torr (blood pressure, vacuum).

Key conversions

1 bar = 100,000 Pa is about 14.5 psi. 1 atm = 101,325 Pa is about 14.7 psi. 1 psi is about 6895 Pa.

Where it helps

Checking tyre pressure across psi and bar, reading weather pressure, and engineering specs.

Frequently asked questions

How many psi in a bar?

About 14.5 psi per bar.

What is 1 atmosphere?

Standard atmospheric pressure: 101,325 Pa or about 14.7 psi.

What is mmHg used for?

Blood pressure and vacuum; 1 mmHg is about 133.3 Pa.