Pressure Converter Online

Pressure shows up in different units depending on the field — weather forecasts use hPa or millibars, car tyre gauges use PSI, hydraulic systems use bar, and scientific work uses pascals. This tool converts any pressure value across all common units instantly.

How it works

Enter a value, select your source unit, and the tool calculates the equivalent in every other supported unit using standard conversion constants. All conversions happen client-side in your browser.

How to use it

1. Select Pressure from the unit categories if it isn't pre-selected
2. Enter your numeric value
3. Choose the source unit from the dropdown
4. Read all converted values in the results panel — click any to copy it

Supported units

Pascal (Pa), kilopascal (kPa), megapascal (MPa), bar, millibar (mbar), atmosphere (atm), PSI (pounds per square inch), torr, and mmHg.

A few things worth knowing

• Pascal: The SI unit of pressure — one newton per square metre. Most scientific and engineering contexts use pascals or kilopascals
• Bar vs atmosphere: One bar is close to one atmosphere (1 atm = 1.01325 bar). Weather forecasts often use hPa (hectopascals), where 1013 hPa ≈ standard sea-level pressure
• PSI: Pounds per square inch — the standard unit for tyre pressure gauges and pneumatic tools in the US and UK
• Torr and mmHg: Historically used in vacuum measurement and blood pressure respectively; 1 torr ≈ 1 mmHg

FAQ

How do I convert PSI to bar? Multiply PSI by 0.0689476. For example, 30 PSI ≈ 2.07 bar.

What is standard atmospheric pressure in common units? 1 atm = 101,325 Pa = 1.01325 bar = 14.696 PSI = 760 mmHg.

What's the difference between gauge pressure and absolute pressure? Gauge pressure is measured relative to atmospheric pressure (so 0 PSI gauge = normal air). Absolute pressure includes atmospheric pressure in the measurement. This tool converts absolute values.

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