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 22, 2020

Racing Fundamentals with Air Density article in

Our latest article is live over at It's about racing fundamentals when it comes to engine tuning.

In it, we discuss some weather basics and how those are applied to different types of racing including drag racing, top speed, and sprint car events. Check it out.

Racing Fundamentals with Air Density Tuning

June 1, 2020

June is here!

We made it to June. Slowly we are getting out of the house and into a regular groove. It's been a long couple of months.

Over the last couple of weeks I have been updating the database of tracks to make sure everything is current. If you've noticed a discrepancy in any of the tracks listed, let us know and we'll update it.

As always, if you race at a site that isn't listed here, we'll add that too.

May 21, 2020

…And more tracks added

There have been even more tracks added to the site lately.

Send us your tracks if you don't see them listed on our site. Just fill out our contact form and we'll add them right away.

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