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

July 1, 2021

What’s New – July 2021

Thanks so much to everyone who has sent in tracks to be added recently. We are getting close to reaching our 900 track goal. If you track still isn't listed, send it over! and we'll add it.

Recently added tracks include:

June 1, 2021

What’s new – June 2021

It's so nice to be getting out and around almost like the pandemic never happened! And with the warm weather, we're excited for some racing. We've added more tracks to the site. If you're track isn't listed, let us know and we'll add it.

May 27, 2021

Trial and Error Tuning: our newest article

Check out our newest article over at

Motorsports Fuel System Tuning With Trial and Error or Better

We discuss common trial-and-error tuning methods and what's going on under the hood.

view news archive

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