RC Gear Calculator Pro

Don't ration your ratios

The only tool you need for gears and ratios

It's time to ditch those clunky gear ratio charts - now you have it all and more in a handy app!
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With the So Dialed Gear Calculator Pro app, enter your current gears, and easily see what ratios you could achieve with a range of other pinions and spurs, and see the actual difference those gears will make - for instance, you could see that a 24-tooth pinion would be an 18% change in ratio (and load on the motor).
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Ideal for:
- Electric cars and trucks in 1/8, 1/10, and 1/12 scale
- On-road, off-road, dirt oval, and drag
- Using foam tires? Cool, just enter your tire diameter, and you'll get rollout as well

Features:
- Compare before/after ratios / FDR / rollout
- Database of internal ratios to get FDR quickly
- See ratio/FDR/Rollout as you browse gears
- Save cars and easily switch between their gears
- Dark mode

To manage and share setups, get tips, and log races, also check out our RC Setup App.

Looking for our online gear calculator? It's over here.

Racers Love Us

Travis C.

This app is awesome! It has all the main RC cars already in it. You don't have to go look up diff ratios, it's already in there per your car! Best free app I've ever downloaded. It led me to download their other apps.

Joseph O.

Great to have a quick calculator on hand when at the track. Nice to have a compare feature to see current and new gear change calculation.

Chris W.

Helps me go fast.

Zaulu B.

Good app - it really lets you see what you are doing when pairing your gears. I would recommend it for anybody trying to hit high speed.

Cody B.

Helped me get a perfect top out speed and keep good temps.

Jeremy F.

A must-have for RC racing.

Dale S.

I like the rollout and the red and green percent change as it relates to rpm and motor temps.

William W.

This app is a big help to me to actually know and see what my drag car is doing. Very useful app, highly recommend it to anyone who drag races.

Frank G.

It's nice to see which values you set on the car without calculating, and the changes are displayed directly, including explanations of how the settings affect you.

Alan L.

Easy to use and covers a wide range of models

Clay B

AWESOME APP FOR RC NO PREP OUTLAW! GOD BLESS ✝️

John M.

Great app! Especially helpful to have "current" and "new" displayed side by side!

B. C.

Very effective app & easy to use. The side-by-side comparison of current & desired gearing is the best part. Also, I'd like to thank you guys/girls @ RC Gear Calculator Pro. You've helped me a lot with gearing my ARRMA LIMITLESS ⅐ scale speedrun car. Saved me a substantial amount of time using this app.

Cole M.

Great little tool, get their other app too, called "SO DIALED." It's a lifesaver for tuning!

Jonathan H.

Excellent tool to manage your desired FDR. I use it on my touring car and my 1/12 pan car.

Kris D.

Great info fast. Makes changing gears very quick

Heath M.

It has changed me as a human, made me care a little more about humanity and the fellow creatures on this Earth. It's also a great R/C gear calculator.

Michael D.

Life saver...awesome app that helps tremendously.

Dane K.

Works great - easy way to figure out final rollout.

Louis M.

Very easy and intuitive to use. It has been really helpful pairing different spur and pinion gears. No guessing or calculations needed. 0% or 10% change, or whatever, it shows you.

Richard J.

Awesome. Simple way to see what my changes do. Tire size, gearing, etc. Perfect app. A++++