Ideal Gas Law Calculator

Solve for any variable in PV = nRT. Enter three known values and calculate the fourth. Supports SI and imperial units.

Solve For

Pressure (P)

Pressure Output Unit

Volume (V)

Volume Output Unit

Amount (n)

mol

Temperature (T)

Temperature Output Unit

Standard Conditions

STP (Standard Temperature & Pressure)

T = 0°C (273.15 K), P = 1 atm
1 mol ideal gas = 22.414 L

NTP (Normal Temperature & Pressure)

T = 20°C (293.15 K), P = 1 atm
1 mol ideal gas = 24.055 L

PV = nRT

P = Pressure

V = Volume

n = Moles of gas

R = 0.082057 L·atm/(mol·K)

T = Temperature (Kelvin)