Air Density Calculator

Estimate dry-air plus water-vapor density locally using ideal-gas component pressures.

Air temperature (°C)

Station pressure (hPa)

Relative humidity (%)

—Moist-air density

—lb/ft³

—Water-vapor pressure

—vs. 1.225 kg/m³

Weather calculations run locally in your browser. These tools transform observations with stated formulas; they do not replace official forecasts, alerts, measurements, or professional field instruments.

How to use this Air Density Calculator

Calculate moist-air density from temperature, pressure, and relative humidity. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.