basic

Vapor Density from Molar Mass Calculator

VD = M / 2 (relative to H₂); also density at STP.

Compute the vapor density of a gas relative to hydrogen (VD = M / 2) from its molar mass, and the corresponding mass density at standard temperature and pressure (ρ = M / 22.414 g/L at STP).

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

Inputs

g/mol

Results

Enter values and click Calculate to see results.
Was this helpful?

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

VD (vs H₂) = M / 2; ρ_STP = M / 22.414 g/L.

In depth

Compute the vapor density of a gas relative to hydrogen (VD = M / 2) from its molar mass, and the corresponding mass density at standard temperature and pressure (ρ = M / 22.414 g/L at STP).