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

October 8, 2020

Our latest article for

We recently wrote an article for about weather considerations for tuning methanol. Check it out.

Weather Considerations for Racing Methanol

October 1, 2020

Site updates – October 2020

Over the last couple of months we've added several more tracks to the site. We are always adding tracks. If you're track isn't listed, let us know and we'll add it.

If you don't already, follow us on Facebook. Get regular updates about our site and our articles.

September 10, 2020

Add your track weather to your phone home screen

We recently updated our article on adding your favorite track's weather page to the home on your iPhone. This way you have an icon on the home screen for quick launch directly to the track weather page. No more scrolling through the long list.

Get Quick Access to Weather At Your Favorite Track

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