Ideal Gas Law Calculator

Enter any three ideal-gas variables and solve the fourth with common pressure, volume, and temperature units.

Solve for

Pressure

Volume

Moles / temperature

—PV = nRT · R = 8.314463 J/(mol·K)

Ideal-gas reverse solver & molar volume

Solve P, V, n or T from the other three using a consistent SI model, then report molar volume and the substituted PV = nRT equation.

Solve forP (kPa)V (L)n (mol)T (K)

—Solved quantity

—Molar volume

Ready.

The ideal-gas model becomes less accurate at high pressure or near condensation.