RC Gear Calculator is now RC Pit Calc Pro!

One calculator to rule them all - calculate ratios, FDR, rollout, pill insert geometry, top speed, shock oil changes, corner weights, fuel usage, and more!
RC Gear Calculator Pro on the App StoreRC Gear Calculator Pro on the Google Play Store
RC PCP does it all

The only calculator you need for RC cars

RC Gear Calculator Pro now does much more! All the calculators you need for RC car bashing and racing are now in one free app.

GEAR RATIO CALCULATOR
Easily calculate your gear ratio, final drive ratio, or rollout. Enter your gears "before and after" to see the real impact of your gear and tire changes as a percentage (e.g. +2.5%), so you'll know exactly how much speed and motor load to expect.  

PILL INSERT/SUSPENSION GEOMETRY
Find your toe, anti-squat, kick-up, roll center, and track width! Supports all popular cars that use pill inserts inserts, and works with custom suspension mounts.

CORNER WEIGHTS
Enter the corner weights for your car, and we'll break down the weight biases for front-rear, left-right, and cross weight/wedge.

OIL TEMP & VISCOSITY
Racing on a hotter or colder day than usual? Use this calculator to see exactly what shock oil you should use to the get the same car feel as usual.

FUEL USAGE
For nitro racers, this calculator shows you how much fuel your car uses per minute in racing conditions, and it shows how much fuel you'll need to finish long races, and how many pit stops you'll need.

TOP SPEED
For electric cars with brushless motors, enter some basic info about your car, and get a good estimate of its top speed!

OIL BLENDING
Out at the track and don't have the shock oil you need? I bet you do have some of those super thick and thin oils sitting around you never use - why not blend them? Use this calculator to see what proportions to use to blend oils to get the exact viscosity you want.

FEATURES
- App remembers your data entries for each car
- Comes with car data (e.g. spur gear, transmission ratio, pill insert geometry) for hundreds of popular cars
- Walkthroughs and detailed help pages describing each calculator and how to use them

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++++