Ideal Gas Law Calculator (PV = nRT)
Solve PV = nRT for P, V, n or T. Uses R = 0.08206 L·atm/(mol·K).
Result
Pressure (P)
1.0007 atm
Concept
The ideal gas law combines Boyle's Law (P ∝ 1/V), Charles's Law (V ∝ T) and Avogadro's Law (V ∝ n) into a single equation. It describes the behaviour of an ideal gas — one where particles have no volume and no intermolecular forces.
R = 8.314 J/(mol·K) is the universal gas constant. Temperatures must be in Kelvin (K = °C + 273.15). Pressures in Pa and volumes in m³ give energy in Joules directly.
Real gases deviate from ideal behaviour at high pressures and low temperatures — the Van der Waals equation adds correction terms for molecular volume and attractions.
Formula
P=nRTV
V=nRTP
n=PVRT
T=PVnR
Variables
PPa or atm- Absolute pressure of the gas.
Vm³ or L- Volume of the gas.
nmol- Amount of substance.
R8.314 J/(mol·K)- Universal gas constant.
TK- Absolute temperature — must be in Kelvin, not Celsius.