RC Speed Calculator Pro

How fast can your R/C car go at top speed? Try our calculator to get an estimate for any electric RC car or truck.
RC Speed Calculator Pro on the App StoreRC Speed Calculator Pro on the Google Play Store
How fast is your speed demon?

Top speed estimates, easy

Quickly and easily get an estimate for your RC car's top speed with RC Speed Calculator Pro! Just tell us which car you have, enter some info about your gearing, motor and batteries, and we'll do the rest.

Doing speed runs? Try our RC Speed Run app or our RC Gear Calculator!

Record your estimates to compare different car setups, and if you have a speed gun, you can record your actual top speed along with the estimate.  

Info you'll need:
- Pinion gear teeth
- Battery cells (or voltage)
- Motor Kv rating
- Tire diameter (we can fill this in based on your car type)

Info we probably have already based on your car:
- Spur gear teeth
- Transmission ratio

Please note, our top speed estimates are just that - estimates! We use a formula that works in theory (in perfect, not real-world conditions), but every car and all driving conditions are different, so expect some variation from real measured speeds.

5 Stars on the App Store

Zaheen S.
Awesome app - no formula weighting, just plug numbers, and get the answer.
Logi G.
Speed estimates have been absolutely spot on. Can't fault it one bit.
Rob D.
Easy to use, helps out a lot with tuning. Enjoying the app - I'll be continuing to use this.
Travis C.
Best free app I have ever downloaded, better than pay apps in my opinion. Super helpful.
R. Young
Very good, and easy to use. It is a 10.
Paul V.
Great calculator. Easy to use.
Justin T.
Helpful and easy to use.
Kevin L.
Excellent!
Brian L.
Love this app! The estimates translate in real world - it's not spot on, but it gets you in the ball park!
Mr. C.
Simple app and gets the job done.