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!

May 20, 2019

Nascar weather

Nascar tracks have been added to the list of track weather pages. Racers and racing fans alike can follow the weather on race day. Here are a few:

See the full list of Nascar weather pages.

May 10, 2019

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May 1, 2019

What’s new – May 2019

Lots more tracks have been added and more are getting added all the time. We are working on more developments with our track list. We can add your track if you don't see it.

Have you visited our partner site, We sell books related to engine tuning and reading the weather. We also have a twice-a-year newsletter on that site that features tips and tricks. Read our recent newsletters and sign up.

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