Enter the air pressure, water vapor pressure, and air temperature into the air density calculator. The calculator will display the current air density at those conditions.

## Air Density Formula

The following formula is used to calculate air density.

ρ = (pd / (Rd * T)) + (pv / (Rv * T))

where:

- pd is the pressure of dry air in Pa,
- pv is the water vapor pressure in Pa,
- T is the air temperature in Kelvins,
- Rd is the specific gas constant for dry air equal to 287.058 J/(kg·K), and
- Rv is the specific gas constant for water vapor equal to 461.495 J/(kg·K).

How to calculate air density

**First, determine the pressure of dry air**This can be calculated using a formula, or using a table for air pressure at certain temperatures.

**Next, determine the water vapor pressure**This is dependent on the relative humidity.

**Measure the air temperature**Measure the air temperature and convert it to Kelvin.

**Calculate the air density**Calculate the air density using the formula above.

## FAQ

**What is air density?**

Air density if the total mass of air within a given volume.

**How can air density change?**

Air density can change with temperature and pressure. Increase pressure and temperature both increase density because they are forcing more air into a smaller volume.

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