Pressure Calculator

The Pressure Calculator converts between different pressure units including kPa, psi, bar, mmHg, and atmospheres. Essential for engineering, scientific, and HVAC applications.

Modify the values and click the calculate button to use
Input Pressure
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Related Temperature Calculator | Density Calculator | Vapor Pressure Calculator

Understanding Pressure Units

Pressure is force per unit area and is measured in various units depending on the application and region. Understanding pressure conversions is essential for engineering, scientific, and HVAC applications.

Common Pressure Units

Pascal (Pa) and Kilopascal (kPa)

Pounds per Square Inch (psi)

Bar and Millibar

Atmosphere (atm)

Conversion Factors

From To Multiply by
kPa psi 0.145038
kPa bar 0.01
kPa atm 0.00986923
kPa mmHg 7.50062
psi kPa 6.89476

Applications by Field

HVAC and Building Systems

Industrial Applications

Scientific and Laboratory

Reference Pressures

Condition kPa psi bar
Perfect Vacuum 0 0 0
Standard Atmosphere 101.325 14.696 1.013
Typical Car Tire 220 32 2.2
Scuba Tank 20,700 3,000 207

Note: Pressure conversions are exact mathematical relationships. Always verify the pressure type (absolute vs. gauge) and consider measurement uncertainty for critical applications.