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!

July 16, 2018

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July 9, 2018

Have you visited our partner site? was started several years ago in partnership with This site has many books and other resources for racers.

If you've seen our articles page and want more, check out the free articles available on They just might help you smooth out your setup.

July 2, 2018

What’s new from June

It's getting hot out there! Last month was a busy one for us and it looks like next month will be just as crazy. We did a major site overhaul including some layout issues that should now be fixed. In addition, we did some under-the-hood work on the site to improve the user experience.

As usual, we also added several tracks to the track weather page. Check them out:

If you don't see your track in the list, let us know and we'll add it. We can now add tracks worldwide!

If you've been giving some thought to our online jetting calculator, you can try it out for free to see if it works for you. Just sign up here: Try ProCalc for Free!.

If you need some assitance with a new setup or a nagging problem with your fuel system, we can help! Check out our ProTune and ProTune:Advanced packages.

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