Science Calculators

Ideal Gas Law Calculator

Enter any three of pressure, volume, moles, and temperature to solve for the fourth using the ideal gas law.

22.414 L

Uses PV = nRT with R = 0.082057 L·atm/(mol·K). The default values (1 atm, 1 mol, 273.15K) solve for the classic "22.4 liters at STP" result for one mole of an ideal gas.

How to use this tool

  1. 1Choose which variable to solve for.
  2. 2Enter the other three values.
  3. 3See the calculated result.

Frequently asked questions

Why does 1 mole equal 22.4 liters at STP?+

At standard temperature and pressure (0°C, 1 atm), PV = nRT works out to about 22.4 liters per mole for any ideal gas — a classic chemistry reference point.

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