Air Density Online

weather calculations for racing engine tuning


Jet your car from anywhere with an internet connection. Have a smartphone? You now have a portable jetting calculator.

for tracks

Real-time density altitude from current weather data at various tracks including: NHRA & IHRA dragstrips, road courses, dirt ovals.


Get your MFI fuel system setup programmed into ProCalc. Even get your dyno data added. You get 1 year of access to ProCalc too!

September 11, 2019

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September 2, 2019

What’s new in September

We hope you're having a good labor day and getting in the back-to-school groove. There are several new tracks on the site and we are working on some more upgrades behind the scenes. If there is a track you'd like added, let us know and we'll add it.

August 22, 2019

Using this site with a Kestrel Portable Weather Station

Air Density Online provides weather data for racing engine tuning and we hope it's useful for anyone using it. However it is one tool in the engine tuner's arsenal and can be used in conjunction with other tools out there. Many times, a portable weather station like a Kestrel unit is used in in addition to or instead of a site like this.

Benefits of a Portable Weather Station

This site gets it's weather information from a third party resource. That data comes from several weather stations around the area of the track and is averaged to provide targeted data. We then calculate air density, density altitude, grains, and other tuning values. While this is a good way to get data while not actually being at the track, it may not completely accurate. That's where a portable weather station comes in. When getting ready for your next run, having current weather data is beneficial for accurate tuning. A portable weather station will give data that is current and local to the point you're standing at.

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