Quickly calculate missing dimensions for layouts and designs based on various aspect ratios. Features presets like the golden ratio, custom inputs, and a live visual preview. Automatically copies results to your clipboard.






244+ iOS apps curated and reviewed
The best ratio calculator pro apps on iPhone average 4.2★ across 244+ titles — we've ranked them by what real users actually keep on their phones. Updated August 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 | Free | — | No | No | May 2026 | |
| 2 | $1.99 | 3.0★ (4) | No | No | Aug 2026 | |
| 3 | Free | 4.9★ (409K) | Yes | No | Aug 2026 | |
| 4 | Free | 4.7★ (61K) | No | No | Aug 2026 | |
| 5 | $0.99 | — | No | No | May 2026 | |
| 6 | Free | 4.5★ (126K) | Yes | Yes | Aug 2026 | |
| 7 | Free | 4.9★ (34K) | Yes | Yes | Aug 2026 | |
| 8 | Free | 4.4★ (7) | No | No | Aug 2026 |












Quickly calculate missing dimensions for layouts and designs based on various aspect ratios. Features presets like the golden ratio, custom inputs, and a live visual preview. Automatically copies results to your clipboard.


This utility app offers a clean and intuitive interface for performing calculations. It prioritizes a user-friendly design with large buttons and a clear display for quick and efficient use.


This app offers both basic and scientific calculation modes with over 30 scientific operations. It allows for customization of the app's appearance and includes features for note-taking, drawing, and viewing calculation history. It supports high accuracy calculations and nested parentheses.




This app offers both basic and advanced scientific calculations with an intuitive interface designed for tablets and phones. It includes features like currency conversion, calculation history, and the ability to share results. An optional premium membership removes ads and provides enhanced support.


This app offers a straightforward calculation experience, focusing on essential functions without unnecessary complexity. It includes basic arithmetic, percentage calculations, and advanced functions like square root. Users can customize the appearance with multiple color schemes and utilize features like result copying and split-screen multitasking on iPad.


This utility app simplifies calculations for proportional expressions and mathematical formulas. It offers a dedicated ratio calculator for recipes and proportions, and a text calculator that accepts keyboard input or Apple Pencil for complex equations.


This app offers a free basic and scientific calculator with an intuitive interface. It supports fractions, percentages, and advanced editing. Optional upgrades provide specialized calculators for fractions with units, polynomial and linear equation solving, graphing, and geometric shapes.


This app offers a clean and intuitive interface for both basic arithmetic and advanced scientific calculations. It includes a history tape to review past computations and supports various mathematical operations, making it suitable for everyday use and complex problem-solving.


This utility app specializes in calculating proportions, solving for an unknown value in direct and inverse ratio equations. It handles scenarios like price increases and speed decreases, offering a simple yet effective tool for proportion-based problems.




This advanced calculator app offers a powerful math core and algebra engine for basic to complex calculations. It includes features like step-by-step solutions, handwriting recognition, and 2D graphing, making it suitable for students, engineers, and programmers.




A straightforward calculator app designed for simplicity, offering basic arithmetic operations and percentage calculations. It allows users to record and recall past results, customize colors, and enable touch sounds for a personalized experience.


Easily calculate and save frequently used ratios with a clean, user-friendly interface. Ideal for scientific experiments, cooking, and design projects, this tool simplifies proportion management for enhanced learning and hobbies.


This app helps you find the unknown value in proportions by showing step-by-step calculations. It's useful for various applications, from cooking to science, and offers a simple, fast, and visually appealing way to solve proportion problems.




Save and reuse frequently used ratios with this calculator. It supports pre-set ratios for screen sizes, aspect ratios, and common mathematical constants. Quickly calculate missing values with decimal point support.


This comprehensive calculator app offers a wide range of tools for everyday calculations, from basic arithmetic and scientific functions to unit and currency conversions. It includes specialized calculators for loans, health, fuel costs, GPA, and more, all within a clean and user-friendly interface.