249+ iOS apps curated and reviewed
The best conversion calculator free apps on iPhone average 4.8β across 249+ titles β 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 | 4.8β (192K) | Yes | Yes | Aug 2026 |
| 2 |  | Free | 4.7β (70K) | Yes | Yes | Aug 2026 |
| 3 |  | Free | 4.7β (48K) | Yes | No | Aug 2026 |
| 4 |  | Free | 4.7β (1.3K) | Yes | No | Aug 2026 |
| 5 |  | Free | 4.9β (129K) | Yes | No | Aug 2026 |
| 6 |  | Free | 4.7β (15K) | Yes | Yes | Aug 2026 |
| 7 |  | Free | β | Yes | No | Jul 2026 |
| 8 |  | Free | 4.8β (15K) | No | No | Aug 2026 |
Easily convert between a wide range of units across 20 categories, including length, weight, temperature, and more. Features live currency updates for 155 world currencies, refreshed daily. Designed for simplicity and visual appeal.
This app provides real-time exchange rates for all world currencies, including cryptocurrencies, and functions offline. It features an embedded calculator, the ability to set custom rates, and updates hourly. An optional premium version removes ads and offers additional features.
Quickly convert between thousands of units with an intelligent search and autocomplete feature. This app offers a streamlined interface, an integrated calculator, and the ability to save favorite conversions. It supports over 6,400 units across 51 categories, making it a comprehensive tool for all your conversion needs.
Easily convert between various units of measurement including length, weight, temperature, and currency. Features automatic currency updates, a vast selection of currencies, and customizable display options for accuracy and rounding. Optimized for multitasking on iPad and offers a beautiful dark design.
Easily convert currencies with real-time exchange rates for over 150 global currencies, including cryptocurrencies. This app offers a simple interface and offline functionality, making it ideal for travelers. Exchange rates update automatically, and conversions happen as you type.
This app is a versatile unit and currency converter with a user-friendly interface. It supports a wide range of conversion categories, including real-world and crypto currencies, with automatic exchange rate updates. Customize your experience with design options, dark mode, and adjustable home screen layouts.
This app provides a comprehensive unit and currency converter with a user-friendly interface. It offers offline functionality, supports over 30,000 unit conversions, and includes more than 160 currencies with live exchange rates. Users can save favorite conversions and get precise results.
This app offers a simple and powerful way to convert between over 140 units across 12 categories. Easily switch between units, customize your experience with themes, and share your results.
Easily convert between various units of measurement, including currencies, temperature, length, and weight. This intuitive tool provides real-time currency exchange rates and a comprehensive list of conversions for everyday use.
Easily convert over 160 currencies and 350 physical units with real-time updates and offline capabilities. Create a favorites list for quick access to frequently used conversions and enjoy geo-based currency options. An ad-free version is available for purchase.
This app functions as a powerful graphing calculator with extensive scientific functions, unit conversion, and a built-in math and science reference. It supports graphing multiple equations, polar coordinates, and implicit functions, making it ideal for complex calculations and homework.
This app allows you to perform calculations by simply typing questions in plain English, without needing to select modes. It handles everyday math, finance, developer calculations, and scientific functions, acting as a running scratchpad for continuous calculations. It also offers live currency conversion and can fall back to AI for complex queries.
This app offers a powerful and user-friendly unit converter with 16 categories, including currency, length, and temperature. It allows for custom unit lists and provides live exchange rate updates for 148 currencies. Unlock all features with a one-time in-app purchase.
This app generates a personalized Roth Conversion Report for 2026, which is emailed directly to you. It provides insights to help you make informed financial decisions regarding your retirement savings.
Instantly convert between common metric and imperial units for temperature, weight, distance, height, and length. Designed for quick checks in daily life, travel, and school, it offers a simple interface with customizable themes.
This app offers a comprehensive suite of mathematical calculation tools, from basic arithmetic to advanced calculus and matrix operations. It also includes unit conversions and saves your calculation history for easy review. Personalize your experience with themes and night mode.
This comprehensive toolkit offers a fast and powerful calculator for daily needs, students, professionals, and businesses. It includes basic, scientific, EMI, GST, and age calculators, along with a unit converter in a clean, modern interface.
This utility app provides essential calculation tools with a unique memory pad to store your equation history. It offers basic arithmetic and trigonometric functions for quick and easy computations.