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!

Thanks for visiting our site. We provide real-time, historical, and forecast weather data for racing engine tuning. We also provide engine tuning tools for mechancial fuel injected racing engines. We are constantly adding tracks to the site. If you'd like to see your track added to the list, send it over. Learn more about this site and it's creators or read some of the articles we've written.

What's New

January 1, 2022

Happy New Year!

Here's to a fast and fantastic 2022 to all!

December 24, 2021

Happy Holidays!

Happy Holidays to You!

Happy Holidays to You!

Bob and Jennifer wish everyone a happy holiday season! See you next year!


December 1, 2021

What’s New – December 2021

We did it! We now have 900 tracks on the site. You can view current, historic, and forecast weather for over 900 tracks worldwide! Thanks to everyone who sent in tracks. It helped a lot.

Here are the tracks we added last month.

We want to keep going! Send us your tracks so we can list them on the site.

view news archive

Thanks for visiting. View the FAQ section for more information about using this site.


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