ChemBench

Ideal Gas Law Calculator

PV = nRT, solved for pressure.

One equation, four connected variables

The ideal gas law links pressure, volume, moles, and temperature into a single relationship — change any one (holding the others' relationships fixed) and the rest respond predictably.

Why 'ideal' — and when that's a fine approximation

Real gases deviate from this law at very high pressure or very low temperature, but at typical everyday conditions the ideal gas law is accurate enough for nearly all chemistry and engineering calculations.

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ChemBench

Ideal Gas Law Calculator

PV = nRT, solved for pressure.

Volume (L)

Moles (n)

Temperature (K)

Pressure

1.001 atm

PV = nRT, solved for P

What you entered

Volume (L): 22.4Moles (n): 1Temperature (K): 273.15

1
P = nRT ÷ V
(1 × 0.0821 × 273.15) ÷ 22.4= 1.0011 atm

Result

Pressure: 1.001 atm

At these conditions, the gas exerts 1.001 atm of pressure.

One equation, four connected variables

The ideal gas law links pressure, volume, moles, and temperature into a single relationship — change any one (holding the others' relationships fixed) and the rest respond predictably.