Air Density Online

Try ProCalc for free!

Set up your new fuel system using ProCalc!
Get 8 days free courtesy of AirDensityOnline.


See ProCalc in action!


Learn more about Pro Calc
or try Pro Calc free for 8 days by filling out the form below:

*further instructions will be emailed to you


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Features include:
  • Up to 8 cylinders with up to 4 jets per cylinder, 1 main bypass and up to 2 high speed bypasses
  • For normally (naturally) aspirated, blown, or turbocharged 4 cycle, 2 cycle, or rotary engines
  • For racing engines on methanol or nitromethane; also E85 or gas
  • Up to 3 Baselines for storing different engine setups
  • Calculate main bypass and system pressure
  • Re-calculate specific engine nozzles
  • Export data as a csv file
  • Calculations are based on air-fuel ratio which is a proven method of maintaining consistency
  • Access your calculations on your internet-enabled cell phone while at the track.
  • Ad-free use of the whole site
  • Track weather updated approx every 20 minutes

Fill out the form to start your free trial today!

Want to see what Pro Calc can offer? Try it free for 8 days and see for yourself!

If you have a constant flow mechanical fuel injection race engine running methanol or nitro fuel, try out Pro Calc for accurate setup and tuning. After 8 days, you will have the option to pay for a full year of access.


fine print:
-Check your spam folder if you do not receive your confirmation email. If the emails are sent to your spam folder, please whitelist the domain airdensityonline.com in order to receive future correspondence.
-Your email address is not shared with third parties. It is used to resend lost passwords and to send occasional announcements regarding your subscription.
-After 8 days, you can pay for the full year by logging into your account and then following this link
-Questions or comments can be directed here