---
title: "Ratio Calc! - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "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 gear"
---

# Ratio Calc! — United States
> Gearing for your R/C car

![Ratio Calc! App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/2f/b7/2f/2fb72f28-5a82-4da8-d215-6db820f71157/AppIcon-0-1x_U007epad-0-1-0-sRGB-85-220-0.png/434x0w.png)

**Developer:** [David Mills](https://apptail.io/developer/david-mills-NWMb)
**Category:** Sports
**Rating:** 4.5/5 (25 ratings)
**Price:** $2.99
**Bundle ID:** uk.co.ashdownapps.ratiocalcnoads
**Store:** Apple App Store
**Country:** United States
**Version:** 7.5.1 (released 2025-11-11)
**Original Release:** 2011-05-12
**Languages:** English, German, Italian, Spanish

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id436311293)
**AppTail Page:** [https://apptail.io/app/ratio-calc-sob/united-states](https://apptail.io/app/ratio-calc-sob/united-states)

## Ratio Calc! Description
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! Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/b7/cf/b5/b7cfb591-824b-fe1b-6d7a-ac71510c872d/English__U005ben_U005d__U007c_iPhone_-_6.9_U0022_Display_-_1.png/1290x2796.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/7b/65/a1/7b65a196-ef8f-8443-feca-cfb47185b614/English__U005ben_U005d__U007c_iPhone_-_6.9_U0022_Display_-_2.png/1290x2796.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/9d/22/39/9d223987-144d-f208-811a-08fa68eb6a37/English__U005ben_U005d__U007c_iPhone_-_6.9_U0022_Display_-_3.png/1290x2796.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/15/98/47/159847c0-5d12-a9ae-3e21-84947865e028/English__U005ben_U005d__U007c_iPhone_-_6.9_U0022_Display_-_4.png/1290x2796.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/ca/29/5b/ca295b02-27b1-bd81-303a-6bf874a1419d/English__U005ben_U005d__U007c_iPhone_-_6.9_U0022_Display_-_5.png/1290x2796.png)

## Ratio Calc! Rating Breakdown in United States
- 5 stars: 21 (84%)
- 4 stars: 0 (0%)
- 3 stars: 1 (4%)
- 2 stars: 2 (8%)
- 1 stars: 1 (4%)

## Ratio Calc! Reviews in United States

### ***** "Best roll-out calc out there"
Keep it up !!!!!! Your last updated totally made my day.
-- Wrxmoose, 2024-12-08

### ***** "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, 2024-02-21

### ***-- "Ratio Calc"
App needs to be updated!
-- nazzy5x, 2021-04-10

### ***** "Perfect!"
Well done! I love the amount of cars you have in the library. Great tool!
-- Korelick, 2017-04-15

### ***** "Ratio Calc"
Best gear ratio app, hands down!
-- dpjensen623, 2016-05-10

### ***** "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.
-- SwanyDelight, 2016-02-24

### ***** "My go to gear ratio app"
Been using this app for years. A must have. They add new cars very quick.
-- JimHfdyfgdg, 2016-02-08

### ***** "Thumbs up!!"
Great app for on the track setups, it's an absolute must for the average to the pro racer!!!
-- cmr151283, 2015-09-20

### ***** "App for real racers"
I wouldn't leave home without it. Gone are all my charts, calipers and notes. Good job guys!
-- Cancun Tom, 2015-09-07

### ***** "Great simple app"
Does 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.
-- Wesley Raven, 2015-05-29

[View all Ratio Calc! reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)

## Ratio Calc! In-App Purchases
| Item | Price |
|------|-------|
| Nice Tip | $0.99 |
| Generous Tip | $2.99 |
| Mega Tip | $4.99 |
| Insane Tip | $9.99 |

## Ratio Calc! Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | Hong Kong SAR China | Sports | #27 |
| Top Paid | Malaysia | Sports | #28 |
| Top Paid | Thailand | Sports | #32 |
| Top Paid | Colombia | Sports | #34 |
| Top Paid | Singapore | Sports | #43 |
| Top Paid | Indonesia | Sports | #45 |
| Top Paid | Italy | Sports | #47 |
| Top Paid | South Korea | Sports | #57 |
| Top Paid | Taiwan | Sports | #58 |
| Top Paid | Ecuador | Sports | #58 |
| Top Paid | Philippines | Sports | #60 |
| Top Paid | Chile | Sports | #62 |
| Top Paid | South Africa | Sports | #64 |
| Top Paid | Austria | Sports | #66 |
| Top Paid | Vietnam | Sports | #67 |
| Top Paid | Portugal | Sports | #68 |
| Top Paid | Romania | Sports | #71 |
| Top Paid | Kuwait | Sports | #76 |
| Top Paid | Greece | Sports | #77 |
| Top Paid | Türkiye | Sports | #78 |
| Top Paid | United Arab Emirates | Sports | #80 |
| Top Paid | Denmark | Sports | #81 |
| Top Paid | Hungary | Sports | #81 |
| Top Paid | Netherlands | Sports | #82 |
| Top Paid | Switzerland | Sports | #82 |
| Top Paid | Australia | Sports | #95 |
| Top Paid | Spain | Sports | #97 |
| Top Paid | Saudi Arabia | Sports | #97 |
| Top Paid | Dominican Republic | Sports | #99 |
| Top Paid | Brazil | Sports | #99 |
| Top Paid | Norway | Sports | #102 |
| Top Paid | Peru | Sports | #103 |
| Top Paid | Germany | Sports | #108 |
| Top Paid | United Kingdom | Sports | #109 |
| Top Paid | Belgium | Sports | #110 |
| Top Paid | New Zealand | Sports | #111 |
| Top Paid | Finland | Sports | #111 |
| Top Paid | Russia | Sports | #116 |
| Top Paid | China | Sports | #116 |
| Top Paid | France | Sports | #117 |
| Top Paid | Japan | Sports | #117 |
| Top Paid | Czechia | Sports | #127 |
| Top Paid | Sweden | Sports | #132 |
| Top Paid | Canada | Sports | #155 |
| Top Paid | Poland | Sports | #174 |
| Top Paid | Ukraine | Sports | #212 |
| Top Paid | Israel | Sports | #247 |

## Ratio Calc! Discovered Keywords
- ratio calc
- rati

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## Ratio Calc! Available In
- [United States](https://apptail.io/app/ratio-calc-sob/united-states)
- [United Kingdom](https://apptail.io/app/ratio-calc-sob/united-kingdom)
- [Germany](https://apptail.io/app/ratio-calc-sob/germany)
- [Italy](https://apptail.io/app/ratio-calc-sob/italy)
- [Australia](https://apptail.io/app/ratio-calc-sob/australia)
- [Switzerland](https://apptail.io/app/ratio-calc-sob/switzerland)
- [Austria](https://apptail.io/app/ratio-calc-sob/austria)
- [South Africa](https://apptail.io/app/ratio-calc-sob/south-africa)
- [Canada](https://apptail.io/app/ratio-calc-sob/canada)
- [Spain](https://apptail.io/app/ratio-calc-sob/spain)
- [Thailand](https://apptail.io/app/ratio-calc-sob/thailand)
- [France](https://apptail.io/app/ratio-calc-sob/france)
- [Taiwan](https://apptail.io/app/ratio-calc-sob/taiwan)
- [Greece](https://apptail.io/app/ratio-calc-sob/greece)
- [Netherlands](https://apptail.io/app/ratio-calc-sob/netherlands)
- [China](https://apptail.io/app/ratio-calc-sob/china)
- [Sweden](https://apptail.io/app/ratio-calc-sob/sweden)
- [Singapore](https://apptail.io/app/ratio-calc-sob/singapore)
- [Malaysia](https://apptail.io/app/ratio-calc-sob/malaysia)
- [Belgium](https://apptail.io/app/ratio-calc-sob/belgium)
- [Colombia](https://apptail.io/app/ratio-calc-sob/colombia)
- [Hungary](https://apptail.io/app/ratio-calc-sob/hungary)
- [Hong Kong SAR China](https://apptail.io/app/ratio-calc-sob/hong-kong)
- [Philippines](https://apptail.io/app/ratio-calc-sob/philippines)
- [Denmark](https://apptail.io/app/ratio-calc-sob/denmark)
- [Norway](https://apptail.io/app/ratio-calc-sob/norway)
- [South Korea](https://apptail.io/app/ratio-calc-sob/south-korea)
- [Romania](https://apptail.io/app/ratio-calc-sob/romania)
- [Madagascar](https://apptail.io/app/ratio-calc-sob/madagascar)
- [United Arab Emirates](https://apptail.io/app/ratio-calc-sob/united-arab-emirates)
- [Malta](https://apptail.io/app/ratio-calc-sob/malta)
- [Mexico](https://apptail.io/app/ratio-calc-sob/mexico)
- [Nigeria](https://apptail.io/app/ratio-calc-sob/nigeria)
- [Nepal](https://apptail.io/app/ratio-calc-sob/nepal)
- [New Zealand](https://apptail.io/app/ratio-calc-sob/new-zealand)
- [Peru](https://apptail.io/app/ratio-calc-sob/peru)
- [Pakistan](https://apptail.io/app/ratio-calc-sob/pakistan)
- [Poland](https://apptail.io/app/ratio-calc-sob/poland)
- [Portugal](https://apptail.io/app/ratio-calc-sob/portugal)
- [Russia](https://apptail.io/app/ratio-calc-sob/russia)
- [Saudi Arabia](https://apptail.io/app/ratio-calc-sob/saudi-arabia)
- [Slovakia](https://apptail.io/app/ratio-calc-sob/slovakia)
- [Tunisia](https://apptail.io/app/ratio-calc-sob/tunisia)
- [Türkiye](https://apptail.io/app/ratio-calc-sob/turkey)
- [Ukraine](https://apptail.io/app/ratio-calc-sob/ukraine)
- [Uzbekistan](https://apptail.io/app/ratio-calc-sob/uzbekistan)
- [Vietnam](https://apptail.io/app/ratio-calc-sob/vietnam)
- [North Macedonia](https://apptail.io/app/ratio-calc-sob/north-macedonia)
- [Armenia](https://apptail.io/app/ratio-calc-sob/armenia)
- [Argentina](https://apptail.io/app/ratio-calc-sob/argentina)
- [Azerbaijan](https://apptail.io/app/ratio-calc-sob/azerbaijan)
- [Bulgaria](https://apptail.io/app/ratio-calc-sob/bulgaria)
- [Brunei](https://apptail.io/app/ratio-calc-sob/brunei)
- [Brazil](https://apptail.io/app/ratio-calc-sob/brazil)
- [Belarus](https://apptail.io/app/ratio-calc-sob/belarus)
- [Chile](https://apptail.io/app/ratio-calc-sob/chile)
- [Cyprus](https://apptail.io/app/ratio-calc-sob/cyprus)
- [Czechia](https://apptail.io/app/ratio-calc-sob/czechia)
- [Dominican Republic](https://apptail.io/app/ratio-calc-sob/dominican-republic)
- [Algeria](https://apptail.io/app/ratio-calc-sob/algeria)
- [Ecuador](https://apptail.io/app/ratio-calc-sob/ecuador)
- [Egypt](https://apptail.io/app/ratio-calc-sob/egypt)
- [Finland](https://apptail.io/app/ratio-calc-sob/finland)
- [Indonesia](https://apptail.io/app/ratio-calc-sob/indonesia)
- [Ireland](https://apptail.io/app/ratio-calc-sob/ireland)
- [Israel](https://apptail.io/app/ratio-calc-sob/israel)
- [India](https://apptail.io/app/ratio-calc-sob/india)
- [Iceland](https://apptail.io/app/ratio-calc-sob/iceland)
- [Japan](https://apptail.io/app/ratio-calc-sob/japan)
- [Kuwait](https://apptail.io/app/ratio-calc-sob/kuwait)
- [Kazakhstan](https://apptail.io/app/ratio-calc-sob/kazakhstan)
- [Lebanon](https://apptail.io/app/ratio-calc-sob/lebanon)
- [Lithuania](https://apptail.io/app/ratio-calc-sob/lithuania)
- [Luxembourg](https://apptail.io/app/ratio-calc-sob/luxembourg)
- [Latvia](https://apptail.io/app/ratio-calc-sob/latvia)

---

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