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!

September 17, 2018

Density Altitude Calculator

In addition to our race track weather pages, we also have a free online density altitude calculator. Our DA calculator provides air density, grains, and vapor pressure too.

Check it out: density altitude calculator

On that same page is an elevation calculator if you need it for your location. We are currently researching other calculators we can offer on that page as well.

September 10, 2018

Check out this Racer Run

Check out drag racer and ProCalc customer, Bill Ketterman in his car The Widowmaker from September 1. His very high output methanol engine has a lot of compression, huge blower size and overdrive, and runs a low percentage of nitro. What a phenomenal run!

If you've got a run you want to share with us, we might even publish it on our site! Send it over and tell us about it.

September 3, 2018

We have a new weather provider!

Over the last several months, we've gotten reports of weather stations used on our site not updating very frequently. It was as frustrating for us as for our users. But, hopefully, all that is in the past. Over the weekend we implemented a new weather provider that seems to be much more reliable.

Our new weather provider will also enable us to add a few new weather features. They will be announced here when they are ready to launch.

view news archive

Thanks for visiting. View the FAQ section for more information about using this site.


© 2018