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!

March 11, 2019

Announcing: Historic weather!

It's been a long time coming but we've finally added historic weather options to the site! Visit the tracks list and select [H] next to the track you want to view. From there you can select a past date to view density altitude, air density and grains. Check out our updated post on historical weather data.

Please note that we are still working out some bugs. Test it out and let us know if you encounter any issues.

March 1, 2019

What’s new for March 2019

Coming soon is the ability to get air density and density altitude for past dates. There have been some delays but it will be up soon. We also have some more updates in the works. In the meantime, we added a couple new tracks this month:

Let us know and we'll add your track too.

February 20, 2019

Review for the racing season

We've written several articles for EngineLabs that feature information about engine tuning. When gearing up for the racing season, check these out:

You can view the full list of articles we've written on our informational articles page.

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