Air Density Calculator
Calculate air density from altitude, temperature, and relative humidity using the International Standard Atmosphere model.
Atmospheric Conditions
ρ = (P_dry × M_dry + P_vapor × M_water) / (R × T)
ISA sea level: 59°F, 29.92 inHg, lapse rate 3.566°F/1000ft.
Air Density
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Density (kg/m³)
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Density Altitude
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Pressure (inHg)
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Comparison
How this was calculated
ISA: Sea level 15°C, 1013.25 hPa, lapse 1.98°C/1000ft. Humid air is lighter (water MW 18 vs air MW 29). Density altitude = ISA altitude matching calculated density.
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Book a free strategy call →Understanding Air Density
Air density depends on pressure, temperature, and humidity -- critical for compressor sizing, flare dispersion, and combustion air requirements. At ISA sea level (59°F, 29.92 inHg), dry air density is 0.0765 lb/ft³. This calculator handles altitude, temperature, and humidity effects using the ISA model and Dalton's law. All calculations run in your browser. Built by Groundwork Analytics.