Air Density Calculator

Compute the density of moist air in kg/m³ from temperature, pressure and relative humidity, plus the derived pressure altitude and the difference from the ICAO standard atmosphere (1.225 kg/m³ at 15 °C, 1013.25 hPa). Useful for engine tuning, drone and aircraft performance, HVAC, ballistics and cycling aerodynamics where thinner air means less drag but also less oxygen. Enter station pressure, or switch to altitude mode and let the barometric formula estimate it. Pure arithmetic, in your browser.