Pressure Converter
Convert between common pressure units instantly.
All Unit Conversions
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This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Converting between pressure units takes just a few steps:
- Enter a value. Type the pressure measurement you want to convert. Decimals work for precise values like 14.696 PSI.
- Select the source unit. Choose the unit your value is currently in, such as PSI, bar, or atm.
- Select the target unit. Pick the unit you need. The conversion happens instantly as you type or change selections.
- Use the swap button to reverse the direction of conversion with one click.
The complete conversion table below the result shows your value in all eight supported units at once. This is useful when you need to communicate a pressure reading across different standards.
Click Share to generate a link with your conversion pre-filled, or Copy to grab the result directly.
About Pressure Units
Pressure measures the force applied per unit area. The SI unit is the Pascal (Pa), equal to one Newton per square meter. Because one Pascal is a very small amount, kilopascals (kPa) and bar are commonly used in science and engineering. Standard atmospheric pressure at sea level is 101,325 Pa, which equals 101.325 kPa, 1.01325 bar, 14.696 PSI, or 1 atm.
PSI (pounds per square inch) is the standard unit in the United States for tire pressure, HVAC systems, and industrial applications. Bar and millibar are widely used in Europe and in meteorology. Medical professionals often measure blood pressure in mmHg (millimeters of mercury), while aviation uses inHg (inches of mercury) for altimeter settings.
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Frequently Asked Questions
How do I convert PSI to bar?
Multiply the PSI value by 0.0689476. For example, 30 PSI equals approximately 2.068 bar. Alternatively, enter the PSI value in this converter and select bar as the target unit for an instant result.
What is standard atmospheric pressure?
Standard atmospheric pressure at sea level is defined as 101,325 Pascals. This equals 1 atmosphere (atm), 1.01325 bar, 1013.25 millibar, 14.696 PSI, 760 mmHg, or 29.921 inHg. These values serve as the baseline for comparing pressures in weather, aviation, and engineering.
What is the difference between gauge pressure and absolute pressure?
Absolute pressure is measured relative to a perfect vacuum (zero pressure). Gauge pressure is measured relative to atmospheric pressure, so gauge pressure = absolute pressure minus atmospheric pressure. A tire gauge reading 32 PSI means 32 PSI above atmospheric pressure. The absolute pressure inside that tire is approximately 46.7 PSI (32 + 14.696). This converter works with the numeric values directly, so make sure your input matches the type of pressure you are working with.
What is mmHg and why is it used for blood pressure?
mmHg stands for millimeters of mercury. It originated from mercury manometers, which measured pressure by the height of a mercury column. Blood pressure is traditionally measured in mmHg because early sphygmomanometers (blood pressure cuffs) used mercury columns. A normal blood pressure reading of 120/80 means 120 mmHg systolic and 80 mmHg diastolic. One mmHg equals approximately 133.322 Pascals.