apps / 436311293
Ratio Calc!
Gearing for your R/C car
David Mills · Sports · $2.99 · US storefront
- rating
- 4.5 ★
- ratings
- 25
- updated
- Nov 11, 2025
- released
- May 12, 2011
v7.5.1
visible word pool · 8 words
title 11/30 chars · subtitle 24/30 chars
App Store search indexes the title and subtitle together with the hidden 100-character keyword field as one combined pool: any phrase assembled from those words can rank. These are the words of Ratio Calc!'s pool that are public — the keyword field is not exposed by any API.
from the listing
Ratio Calc is a quick and easy tool for radio control car racers to use trackside. Knowing your final drive ratio (FDR) is very useful for comparison with other racers to determine if your car is geared correctly. It lets you quickly select your car by filtering on manufacturer and model. Select your pinion and spur size and the FDR is displayed. Tyre diameter can also be entered to calculate your rollout. Ratio and roll out charts are also available which plot pinion and…
latest US reviews
★★★★★
Best roll-out calc out there
Keep it up !!!!!! Your last updated totally made my day.
— Wrxmoose
★★★★★
Please create this for android
I have the app for iphone but I've recently switched to android and would love to use this on my new phone for my rc racing.
— kfakouydk
★★★★★
Ratio Calc
App needs to be updated!
— nazzy5x
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