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!

April 10, 2019

Our latest article on

Check out our latest article featured on

Air Density Tuning at MLRA Lucas Oil Speedway Oval Track, April 12-13, 2019 presented by

This is our second article with them and just the latest article we've written over the years. If you'd like to see the rest of our articles, check out our articles page.

April 1, 2019

What’s New – April 2019

We are developing content left and right. ProCalc users can now populate the weather in each calculator from the location they are at. We are working on developing oxygen/fuel ratio as a companion to air/fuel ratio. We have several articles coming out in the coming months. And... we are adding tracks like crazy!

Here are some of the tracks we added in March:

We are now adding all motorsports tracks to the list. If you race at a Nascar, Formula 1, karting, or any other track, we want to add it. As usual, if you race at a dragstrip or circle track, we'll add that as well. Just send us the track name and location.

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.

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