The RC gear ratio calculator trusted by racers and bashers — plus every other calculator you need at the track, in one free app.
GEAR RATIO CALCULATOR
Calculate gear ratio, final drive ratio (FDR), and rollout from your pinion and spur. Enter your gears "before and after" to see the real impact of gear and tire changes as a percentage (e.g. +2.5%), so you know exactly how much speed and motor load to expect. Built-in transmission data for hundreds of popular RC cars.
TOP SPEED CALCULATOR
For electric cars with brushless motors: enter basic info about your setup and get a solid estimate of your car's top speed.
PILL INSERT / SUSPENSION GEOMETRY CALCULATOR
Find your toe, anti-squat, kick-up, roll center, and track width. Supports all popular cars that use pill inserts, and works with custom suspension mounts.
CORNER WEIGHT CALCULATOR
Enter your car's corner weights and get the full breakdown: front-rear, left-right, and cross weight/wedge.
SHOCK OIL TEMP & VISCOSITY CALCULATOR
Racing on a hotter or colder day than usual? See exactly what shock oil to run to keep the same car feel.
OIL BLENDING CALCULATOR
Don't have the right shock oil with you? Blend the thick and thin oils you already own — this calculator gives you the exact proportions for your target viscosity.
FUEL USAGE CALCULATOR
For nitro racers: fuel burn per minute in race conditions, how much you need to finish long mains, and how many pit stops to plan.
FEATURES
- Remembers your entries for each car
- Built-in data (spur gear, transmission ratio) for hundreds of popular cars
- Walkthroughs and detailed help for every calculator
FROM SO DIALED
Want tuning help beyond the math? Our RC Setup App gives you pro setup sheets for 600+ cars, race logging, and an AI mechanic — find "RC Setup App" on the App Store.
Makes calculating gear ratios easy. Tuning has been much easier
Could be good
jgmay3
Currently won’t allow changing any values, always reverting to what was previously set. Frustrating.Also does not handle screen ratio properly, and hides important buttons behind the keyboard.
Awesome app
Sysop Justin
It helped me figure out exactly what I wanted.
• Fixed a crash when you cleared the Tank size box on Fuel Usage
• Fixed a crash when you deselected your last gear in the gear chooser
• Signing in no longer crashes if your connection drops for a moment
Version 3.4.7
The developer, Degree3, Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Identifiers
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Degree3, Inc.
Size
56.5 MB
Category
Utilities
Compatibility
Requires iOS 14.0.0 or later.
iPhone Requires iOS 14.0.0 or later.
iPad Requires iPadOS 14.0.0 or later.
iPod touch Requires iOS 14.0.0 or later.
Mac Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
