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

April 30, 2021

What’s New – May 2021

We've added a few more tracks to the site.

April 12, 2021

Archive: Air Density Tuning at Lucas Oil Speedway

We wrote about this event from 2 years ago. The information is still relevant and explains how the spring weather might affect an engine during a racing event at Lucas Oil Speedway.

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


April 5, 2021

Archive: Measuring the Atmosphere Around a Track

As we go through our old articles and bring them up-to-date, we thought you might want to brush up on some concepts as well. Here is our one of our first articles that explains the different weather variables we present on the site. You can brush up on your basic weather knowldege to apply at the track.

ProCalc at the track

Measuring the Atmosphere Around a Track

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