David MillsRatio Calc! Customer Service
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 combinations to create very handy reference tables.
- Save your favourite cars for quick access
- Select measurement units (imperial/metric)
- Select your preferred gear pitch, alternative ratios in other pitches will be shown
- Over 2000 cars/variants in the database which is updated regularly
Ratio Calc! App Comments & Reviews
Ratio Calc! Positive Reviews
Perfect!Well done! I love the amount of cars you have in the library. Great tool!.Version: 6.3.1
Fantastic!!Great place to keep notes and gearing for all your cars. Enough models for every occasion!!! Store multiple cars and compare final drive ratios or roll out for accurate records. Will definitely save money on spent motors and speed controls due to over gearing..Version: 4.70
Ratio CalcApp needs to be updated!.Version: 6.6
Time saverThis app allows quick and easy calculations to be made at the track when you need that little extra to beat the competition..Version: 4.40
NiceGreat app for finding FDR. Has a bug on ipad at moment where I cannot hit "done", it does not appear on screen, after setting pinion and spur size, so cannot get out of this mode. Otherwise it does everything we need for finding gear ratios on our RC cars. Thanks for making this app. :-).Version: 4.60
Perfect!This app is great, everything you need it to do. The car database is amazing, its so easy to get more cars added you just email in app and days later they add it. In app updates is another major plus!.Version: 4.01
Great simple appDoes exactly what you need it to do; quickly figure out gear ratios and rollout. Saves your individual cars and their settings. Buy this app for gearing, you won't be disappointed..Version: 6.0
Simple, clean, perfect!In a sea of mish-mashed, garbage R/C related apps, this is an aesthetic oasis. It does exactly what you downloaded it for and doesn't give you a migraine in the process. What more do you want? Hmm. Maybe a watch app? Oh yeah, the dude made that too. Excellent work..Version: 6.1
Awesome RC app!!!Very nicely done & easy to use! I was very surprised to find all the Custom Works cars included - even the new Dominator 2. The tables are great for cross referencing ratios rollout! Great App!!!.Version: 3.41
Nice app but needs moreGreat app and excellent user interface. This is almost a killer must have app. It needs input for battery used and motor specs, then you can calculate speed base on output. You already have rollout, just missing a few pieces..Version: 4.50
Nice appI just down loaded this app. Very easy to navigate. It would be nice to have mod 1 pitch. Also a speed chart for comparison. Other than that this is an awesome app for the track. Keep updates coming..Version: 4.50
Great tool!This a fantastic app to have. Just got back into dirt oval racing and finding out rollout and what-if rollouts is great. Saves time and makes it simple..Version: 4.70
My go to gear ratio appBeen using this app for years. A must have. They add new cars very quick..Version: 6.1
App for real racersI wouldn't leave home without it. Gone are all my charts, calipers and notes. Good job guys!.Version: 6.0
Very useful.Had all three of my cars. Very helpful..Version: 4.60
Sweet appGreat app. rollout chart is great, my only complaint is i would like to select gear pitch for each car. I use 64p on pan cars and 48 on dirt oval.Version: 4.10
Thumbs up!!Great app for on the track setups, it's an absolute must for the average to the pro racer!!!.Version: 6.0
RacerWorks really well in Dirt Oval applications. Very simple to use..Version: 4.80
Awesome app!Really easy to use.Version: 4.10
Love it but pls update new modelsGreat app but please update app to include new kits :-) thanks.Version: 4.70
Great !!!You've done a great job with this app !.Version: 5.03
Great appGreat app, I only wish it had More.Version: 4.20
Very nice!Very good but need to set gear pitch for each car..Version: 4.10
Great appThis is a great app. Very easy to use..Version: 4.60
Great Gear Ratio AppWorks Great. Very Helpful. Works Great at the Race Track!!!! Later HB.Version: 4.0
Ratio CalcBest gear ratio app, hands down!.Version: 6.1
Awesome! Easy!!.Version: 5.10
AppVery nice.Version: 4.01
Please create this for androidI 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..Version: 6.6
Nice AppGreat App..Version: 4.60
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