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Gas Density from Molar Mass at STP Calculator

ρ = M / 22.414 g/L at IUPAC STP, or P·M / (R·T) generally.

Compute the density of an ideal gas from its molar mass either at IUPAC STP (ρ = M / 22.414 g/L) or at arbitrary pressure / temperature using the ideal-gas law (ρ = P · M / (R · T)). Reports density in g/L and kg/m³.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

g/mol
atm
K

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

ρ = P · M / (R · T), with R = 0.08206 L·atm/(mol·K).

In depth

Compute the density of an ideal gas from its molar mass either at IUPAC STP (ρ = M / 22.414 g/L) or at arbitrary pressure / temperature using the ideal-gas law (ρ = P · M / (R · T)). Reports density in g/L and kg/m³.