Air Density Ratio Calculator (Actual/Standard)

Air Density Ratio Calculator (Actual/Standard)

Actual Air Density (kg/m³): Standard Air Density (kg/m³):

What is Air Density Ratio?

The air density ratio is the ratio of actual air density to standard air density. It is a dimensionless number that helps evaluate the effect of atmospheric conditions on processes like combustion, ventilation, and aerodynamics.

Formula

Air Density Ratio = Actual Air Density / Standard Air Density

Standard Air Density

Standard air density is typically taken as 1.225 kg/m³ at sea level under ISA (International Standard Atmosphere) conditions: 15°C temperature and 101.325 kPa pressure.

Why It Matters

Used in engine tuning to understand air-fuel ratios.
Helps normalize airflows in HVAC and compressor systems.
Important in flight performance and aerodynamic testing.