Ideal Gas Law Calculator - Calculator Suite

Ideal Gas Law (PV = nRT)

Pressure (P) in atm:

Volume (V) in L:

Number of moles (n):

Temperature (T) in K:

Ideal Gas Law:

PV = nRT

R = 0.08206 L⋅atm/(mol⋅K)

Leave one field empty to calculate it

STP Calculations

Volume at STP (L):

Mass (g):

Molar Mass (g/mol):

Standard Temperature and Pressure:

STP: 0°C (273.15 K) and 1 atm

1 mole = 22.4 L at STP

Gas Density Calculator

Pressure (atm):

Temperature (K):

Molar Mass (g/mol):

Gas Density Formula:

ρ = PM/(RT)

Where ρ is density in g/L

Combined Gas Law

Initial Pressure (P₁) in atm:

Initial Volume (V₁) in L:

Initial Temperature (T₁) in K:

Final Pressure (P₂) in atm:

Final Volume (V₂) in L:

Final Temperature (T₂) in K:

Combined Gas Law:

P₁V₁/T₁ = P₂V₂/T₂

For a fixed amount of gas

Partial Pressure (Dalton's Law)

Total Pressure (atm):

Moles of Gas A:

Moles of Gas B:

Moles of Gas C (optional):

Dalton's Law:

P_total = P_A + P_B + P_C + ...

P_A = X_A × P_total

Where X_A is mole fraction of gas A

Effusion Rate (Graham's Law)

Molar Mass 1 (g/mol):

Molar Mass 2 (g/mol):

Rate of Gas 1 (optional):

Graham's Law:

rate₁/rate₂ = √(M₂/M₁)

Lighter gases effuse faster

🌡️ Ideal Gas Law Calculator