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Ratio Calc! icon

Ratio Calc!

David Mills

Category: Sports
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Rankings updated

Price and ratings

Price
CA$3.99
Rating
4.2 out of 5
Ratings
9Germany

Versions

Released
12 May 201115 years ago
Last update
1 day agoVersion 7.6
Requires
iOS 17.0 or later

Details

Size
72.7 MB
Languages
6
Website
sllim-code.com (opens in a new tab)

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 spur gear…

Countries3In 3 charts right now
Best rank now#39Canada Paid · Sports
Ratings, 7 days—Needs a week of rating history
Longest chart run2 daysCanada Paid · Sports

Competitors

Full chart

Top of Paid · Sports in Canada. Ratio Calc! is #39 there. Changes are over 7 days.

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Store listing

How the app presents itself on the App Store. Select a screenshot to open it full size.

Ratio Calc! screenshot 1 of 5Ratio Calc! screenshot 2 of 5Ratio Calc! screenshot 3 of 5Ratio Calc! screenshot 4 of 5Ratio Calc! screenshot 5 of 5

What's new

Version 7.6 · 8 Oct 2026 · 1 day ago

-Updated for the latest devices -Refreshed database -Fixed a few small bugs

Current rankings

Every chart this app is in right now, best position first.

Ratio Calc! chart positions
ChartRank24 h7 daysBestDays on chart
Canada· Paid · Sports#39Down 10 placesChange unknown#292
Australia· Paid · Sports#93Up 3 placesChange unknown#892
Brazil· Paid · Sports#99No changeChange unknown#982

Rank history

Higher on the chart is better: #1 is at the top.

Sign in to see 30 days, 90 days and all history.

Canada · Paid · Sports: best #29, latest #39, over 3 snapshots since 8 Oct. No snapshots from 8 Oct to 9 Oct and on 9 Oct; the line joins the snapshots on either side.

Canada · Paid · Sports: best #29, latest #39, over 3 snapshots since 8 Oct. No snapshots from 8 Oct to 9 Oct and on 9 Oct; the line joins the snapshots on either side.

Ranking events

Entries, big moves, #1s and new versions we've recorded.

  1. Entered the Paid · Sports chart at #99Germany