Ideal Gas Law Calculator - Calculator Suite

PV = nRT Calculator

Calculate:

Pressure:

Volume:

Moles (n):

Temperature:

STP Conditions Calculator

Moles of Gas:

STP Conditions:

Gas Density Calculator

Molecular Weight (g/mol):

Pressure (atm):

Temperature (K):

Gas Mixture Calculator

Total Pressure (atm):

Mole Fractions (comma-separated):

Gas Names (comma-separated):

Ideal Gas Law Reference Guide

Ideal Gas Law:

PV = nRT

P = pressure, V = volume, n = moles, R = gas constant, T = temperature

Gas Constants (R):

0.08206
L·atm/(mol·K)

8.314
J/(mol·K)

62.36
L·torr/(mol·K)

1.987
cal/(mol·K)

Standard Conditions:

Current STP:

T = 273.15 K (0°C)

P = 1 bar (100 kPa)

Molar volume = 22.7 L/mol

Old STP:

T = 273.15 K (0°C)

P = 1 atm (760 mmHg)

Molar volume = 22.4 L/mol

Related Equations:

Density: d = PM/RT (P=pressure, M=molar mass)

Dalton's Law: P_total = P₁ + P₂ + P₃ + ...

Partial Pressure: P₁ = X₁ × P_total

Mole Fraction: X₁ = n₁/n_total

Assumptions:

Gas particles have no volume
No intermolecular forces
Elastic collisions only
Random molecular motion
Valid at high T, low P

⚗️ Ideal Gas Law Calculator