--- title: "Ratio Calc! — App Overview" url: https://marlvel.ai/apps/uk-co-ashdownapps-ratiocalcnoads category: Sports developer: David Mills platforms: ios rating: 4.5 (24 ratings) pricing: paid report_level: overview generated: 2026-04-27 last_verified: "2026-04-30T08:41:22.006Z" --- > **Key Insight:** This app serves as a highly-rated, specialized tool that streamlines the technical setup process for RC car enthusiasts. | Metric | Value | |--------|-------| | Category | Sports | | Rating | 4.5 ★ (24) | | Pricing | paid | | Platforms | iOS | | Latest Version (iOS) | 7.5.1 | | Developer | David Mills | ## What is Ratio Calc!? Ratio Calc! is a specialized utility for radio control car racers designed to calculate Final Drive Ratio (FDR) and rollout measurements. It features a comprehensive database of over 2,000 car models and provides reference charts for gear combinations to assist with trackside tuning. ## Key Features - **Vehicle Database**: Provides access to over 2,000 car models and variants for quick selection and calculation. - **FDR and Rollout Calculator**: Calculates Final Drive Ratio and rollout based on user-inputted pinion, spur gear, and tyre diameter data. - **Reference Charts**: Generates handy tables plotting various pinion and spur gear combinations for quick reference. - **Customization Options**: Supports imperial and metric units, preferred gear pitch selection, and the ability to save favorite car configurations. ## Who is it for? Radio control car racers seeking precise gear ratio and rollout calculations for vehicle tuning. ## Links - [App Store](https://apps.apple.com/us/app/ratio-calc/id436311293?uo=2) - [Full Intelligence Report](https://marlvel.ai/apps/uk-co-ashdownapps-ratiocalcnoads) --- *This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/apps/uk-co-ashdownapps-ratiocalcnoads).* *Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*