Pressure Converter

Convert pascals, bar, psi, atmospheres and mmHg.

Pressure Converter

Universal unit converter engine

Conversion Category

From Value

Converted Result

Conversion Formula1 nm = 0.001 µm

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What does Pressure Converter do?

Convert between twelve pressure units used in engineering, meteorology, medicine and tyre inflation. Reference values for atmospheric pressure and common tyre pressures are included.

How to Use Pressure Converter

1
Enter a pressureAny value.
2
Choose the unitsFrom and to.
3
Compare the reference valuesTo sanity-check your result.

Key Features

Twelve units across engineering, weather and medical use
Exact factor: 1 psi = 6894.757 Pa
Reference values for tyre pressure, atmospheric pressure and blood pressure
All units shown at once
Millibar and hectopascal shown together, as they are numerically identical

Frequently Asked Questions

How do I convert psi to bar?

Divide by 14.5038. A 32 psi tyre is 2.21 bar. Many European gauges read in bar while manuals quote psi, which is the usual reason for looking this up.

What is standard atmospheric pressure?

101,325 pascals, which is 1013.25 hPa, 1.01325 bar, 14.696 psi or 760 mmHg. Weather reports use hectopascals or millibars, which are the same number.

Why is blood pressure measured in mmHg?

Because the original instrument was a mercury column, and the height of that column in millimetres was the reading. Modern devices are electronic but kept the unit for continuity with a century of clinical data.

What is the difference between torr and mmHg?

Almost nothing — they differ by about one part in seven million. A torr is defined as exactly 1/760 of a standard atmosphere; a mmHg is defined from mercury density and standard gravity.

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Conversions run in your browser using fixed, published factors. Nothing you enter is transmitted, and the tool keeps working with the network disconnected.