Air Density Calculator
Calculate the density of air from temperature, pressure and humidity, with density altitude, free online.
About this calculator
Moist air density ฯ = (p_d รท (R_dยทT)) + (p_v รท (R_vยทT)), with the dry-air gas constant 287.058 and the vapour constant 461.495 J/kgยทK. Vapour pressure comes from the Magnus formula. Density falls with heat, altitude and humidity โ it matters for engines, drones, ballistics and aircraft performance.