Air Density Calculator

AutoDues - Air Density Calculator

A great app we use at Velobike is called AutoDens. The app is available on Apple mobile devices for free on the app store.

AutoDens calculates air density live from over 40,000 airports all around the world. Any given day (or time of day) may have a different air density value based on the temperature and dewpoint variables. The higher this ‘Density Altitude’ value, the thinner the air is and the faster you will go.

 To view a current air density, Select an airport nearest to your velodrome which will assess the local conditions. You can manually adjust the numbers if you have more accurate temperature data from the velodrome such as an indoor velodrome temperature. Have a play around, notice the ‘Density Altitude’ value and the ‘Air Density’ volume will change with a change in the variables.


Dew Point: the atmospheric temperature (varying according to pressure and humidity) below which water droplets begin to condense and dew can form.

Elevation: Height above sea level.

Barometric Pressure: the measurement of the weight exerted by air molecules at a given point on Earth. The average sea level barometric air pressure on Earth is 1,013.25 hPa.

Density Altitude: Is the air density given as a height above mean sea level. As temperature and altitude increase, air density decreases

Pressure Altitude: is the altitude in the International Standard Atmosphere with the same atmospheric pressure as that of the part of the atmosphere in question

Air Density: Is the mass per unit volume of Earth's atmosphere. Air density, like barometric pressure, decreases with increasing altitude. It also changes with variation in atmospheric pressure, temperature and humidity. The average air density at sea level is 1.225 kg/m3. The lower this number, the faster your times will be.

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