About this app
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.
Latest release
What’s New
• Fixed the second input box being pushed off the edge of the screen on Fuel Usage • Dividers and edges across the app were too faint to see. They now meet accessibility contrast standards • A refreshed home screen and a new startup screen
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 27, 2026 · 3:24 AM Free
Screenshots
