Air Density Calculator

Your details

Moist air accounts for water vapour, which slightly lowers density. Choose dry air for theoretical or simplified calculations.
You can type in a measured pressure, or let the calculator estimate it from altitude using the International Standard Atmosphere model.
Ambient air temperature. Use 15 °C (59 °F) for standard sea-level conditions.
°C
Atmospheric pressure at the measurement point. Standard sea level is 1013.25 hPa (14.696 psi).
hPa
The percentage of water vapour in the air relative to the saturation amount at the current temperature.
%
Air densityNear standard
1.2211

Mass of air per unit volume at the given conditions

Density unitkg/m3
vs. ISA sea-level (1.225 kg/m3)-0.32%
Dry air partial pressure1,004.72
Water vapour partial pressure8.53
Total pressure used1,013.25
Temperature (K)288.15K
1.2211 kg/m3
Very thin<0.9Thin0.9-1.1Near standard1.1-1.3Dense1.3+

Air density: 1.2211 kg/m3

  • This air is -0.3% lighter than the ISA standard (1.225 kg/m3 at sea level, 15 °C, dry).
  • Density is close to standard. Small changes in humidity, temperature, or altitude will shift it further.
  • Water vapour (molecular weight 18) displaces heavier nitrogen (28) and oxygen (32), so humid air is always slightly less dense than dry air at the same temperature and pressure.

Next stepFor aviation, compare this density to the ISA density at your pressure altitude to find density altitude, which determines aircraft performance more accurately than field elevation alone.

 = Powered by OnlyCalculators