Pressure Calculator – Convert Between Pressure Units
Convert pressure between pascals, bar, PSI, atmospheres, and more. This free pressure converter handles scientific, engineering, and everyday pressure unit conversions instantly.
Pressure Value
Converted Values
Enter pressure to convert
Common Pressure Conversions
At Sea Level:
- 1 atm = 101,325 Pa = 101.3 kPa
- 1 atm = 14.696 psi
- 1 atm = 760 mmHg = 760 Torr
- 1 atm = 29.92 inHg
Common Uses:
- Tire pressure: 30-35 psi
- Blood pressure: 120/80 mmHg
- Scuba tank: 200-300 bar
- Vacuum: <1 Pa
Frequently Asked Questions
What is pressure?
Pressure is force applied per unit area. It measures how concentrated a force is. Higher pressure means more force on a smaller area.
What is the SI unit for pressure?
The pascal (Pa) is the SI unit, defined as one newton per square meter. Kilopascals (kPa) and bar are more practical for everyday use.
Why is PSI still used?
PSI (pounds per square inch) remains common in the US for tire pressure, scuba tanks, and industrial applications due to tradition and tool calibration.
What is atmospheric pressure?
Atmospheric pressure is the weight of air above us. At sea level it's about 14.7 psi or 101 kPa. It decreases with altitude.
How is blood pressure measured?
Blood pressure uses mmHg (millimeters of mercury). Normal is around 120/80 mmHg. This unit comes from mercury barometers used in early measurements.
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