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!

December 17, 2018

New articles from 2018

This year we wrote several articles for various outlets. If you want to dodge your family over the holidays, just tell them you need to read up on this information. Here are the articles we wrote in 2018:

Engine Builder Magazine

If you have ideas for articles you'd like to see from us, let us know!

December 3, 2018

What’s new – December 2018

Happy holidays from us to you! We added more tracks to the site last month. If you are racing anywhere in the world, let us know and we'll make sure your track is listed on our site.

We are working on upgrading certain areas of the site for the upcoming year. If there is a feature you'd like to see on our site, let us know and we'll see if we can add it.

November 26, 2018

Check out our international tracks

Thanks to a new weather provider, we have expanded our list of race track weather locations to be worldwide. We are working on adding tracks from six continents (and we'll be sure to add Antarctica as soon as they have a track!). Here are all the international tracks we've added so far:

Worldwide race track weather

If you've got a track that's not listed - anywhere in the world - let us know and we'll add it to the list.

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© 2018