Pressure Converter
Guide
Pressure Converter
Convert between 12 pressure units instantly across SI, engineering, and weather/medical categories. Enter a value in Pascal, bar, atmosphere, psi, torr, or any other supported unit and see all equivalents update in real time. Includes quick-select buttons for common pressures like standard atmosphere, car tire pressure, and blood pressure readings, plus a reference table for real-world pressure values.
How to Use
Enter a pressure value in any of the 12 supported units and all other units update simultaneously. Use the category tabs to focus on SI units, engineering units, or weather and medical units. Quick-select buttons load common reference pressures for instant conversion. Adjust decimal precision from 0 to 10 places and copy individual values or all conversions to your clipboard.
Features
- 12 Pressure Units – Pascal, kilopascal, megapascal, bar, millibar, atmosphere, technical atmosphere, torr/mmHg, psi, ksi, inches of mercury, and centimeters of water
- Category Tabs – Units organized into SI, Engineering, and Weather/Medical groups
- All Units Simultaneously – Every unit updates in real time as you type in any field
- Quick-Select Buttons – Common pressures: standard atmosphere, car tire, bicycle tire, scuba tank, blood pressure, deep ocean
- Reference Table – Real-world pressure values for quick reference
- Configurable Precision – Set decimal places from 0 to 10
- Copy Values – Copy individual conversions or all results at once
FAQ
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What is the difference between bar and atmosphere?
One standard atmosphere (atm) equals 101,325 Pascals, while one bar equals exactly 100,000 Pascals. The difference is about 1.3%. The atmosphere is defined by the average air pressure at sea level, while the bar was created as a convenient round number close to atmospheric pressure. In practice, 1 bar and 1 atm are often used interchangeably for rough estimates, but the distinction matters in precise scientific and engineering calculations.
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What is torr and how does it relate to mmHg?
Torr and millimeters of mercury (mmHg) are nearly identical units. One torr is defined as exactly 1/760 of a standard atmosphere (133.322 Pa), while 1 mmHg is based on the pressure exerted by a 1mm column of mercury under standard gravity (133.322 Pa). The difference between them is negligible for all practical purposes. Both units are widely used in medicine for blood pressure readings and in vacuum science.
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Why is psi commonly used for tire pressure?
PSI (pounds per square inch) is the standard pressure unit in the US customary system and is used throughout the United States for tire pressure, compressed gas systems, and hydraulic equipment. It measures force in pounds-force applied per square inch of area. Most US tire pressure gauges read in psi, with typical car tires at 30-35 psi, bicycle tires at 80-130 psi, and truck tires at 80-100 psi. In metric countries, bar or kPa are used instead.
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What is a technical atmosphere and when is it used?
A technical atmosphere (at) equals the pressure of one kilogram-force per square centimeter (98,066.5 Pa). It differs from a standard atmosphere (101,325 Pa) by about 3.2%. The technical atmosphere was commonly used in older European engineering specifications, particularly in Germany and Russia, before being largely replaced by the bar and Pascal in modern practice. You may still encounter it in legacy equipment documentation and some industrial standards.
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