Calculate gas pressure using the ideal gas law. Enter gas amount, volume, and temperature to estimate pressure in PSI, kPa, pascals, bar, atmospheres, mmHg, and inches of water column.
Gas amount:
Enter the amount of gas in moles, millimoles, or kilomoles.
Volume:
Enter the container volume. A smaller volume creates higher gas pressure for the same amount and temperature.
Temperature:
Enter the gas temperature. The calculator converts it to Kelvin for the pressure formula.
A gas pressure calculator is useful for chemistry examples, ideal gas law practice, sealed containers, lab calculations, gas tanks, pressure conversions, and comparing absolute pressure to gauge pressure.
This calculator uses the ideal gas law, so real gases can vary at high pressure, very low temperature, or unusual conditions.
The ideal gas pressure formula is:
P = nRT ÷ V
Use the ideal gas law: P = nRT ÷ V. Multiply moles by the gas constant and temperature, then divide by volume.
Absolute pressure is measured from a vacuum. Gauge pressure is pressure above atmospheric pressure.
Yes. If gas amount and volume stay the same, increasing temperature increases gas pressure.
Yes. If gas amount and temperature stay the same, reducing volume increases gas pressure.