168+ iOS apps curated and reviewed
The best free metric conversion tool apps on iPhone average 4.7★ across 168+ titles — we've ranked them by what real users actually keep on their phones. Updated June 2026.
A must-have unit conversion app with over 30,000 conversions, 160 currencies, and detailed historical records. Easily convert weights, temperatures, lengths, areas, volumes, time, angles, and more. Access nine significant digits and fractional results.
Convert Any Unit Lite is a versatile app that simplifies unit conversions for users, offering a wide range of conversion options. Easily switch between various units for length, weight, volume, and more with a user-friendly interface. Download now to streamline your conversion needs.
Easily convert units of measurement with this user-friendly app. Say goodbye to complex calculations and simplify your unit conversions today!
This all-in-one measurement converter app offers 15 categories, including length, mass, speed, and more, allowing users to easily convert between various units. Try it now with a 7-day free trial, then subscribe for just $14.99/month.
This conversion calculator app offers a wide range of unit conversions, from temperatures to lengths, with a user-friendly interface and personalizable themes. Download it now to streamline your tasks and enhance productivity with its smart features and extensive conversion options.
This unit converter app allows users to easily convert measurements between millimeters and inches in both directions, with no ads, in-app purchases, or data requirements. Simply type in your conversion to get the result, making it a convenient and user-friendly tool for everyday use.
A free unit converter app optimized for iPhone and iPad, featuring 12 categories for converting various units including area, currency, data, length, and more. Includes daily currency updates for 155 world currencies and is designed for easy use. Download now for quick and accurate unit conversions.
A powerful measurement conversion calculator app for professionals in design, construction, and more, offering accurate results for various units and dimensions. Seamlessly switch between different measurement systems and access advanced functions for precise calculations and cost estimations. Try it free for 7 days!
Experience quick and easy unit conversions with a free, fast, and elegant calculator tool from Mila's Tools. Convert various units such as Area, Bits, Bytes, Length, Temperature, and more effortlessly. Try it out now for hassle-free conversions!
"An all-in-one conversion tool for engineers and scientists, featuring over 300 units across 32 categories, currency conversion, timezone conversion, and more. Switch between themes, create favorite lists, and enjoy a seamless user experience. Available in multiple languages – download now!"
Convert Units is a comprehensive conversion tool that supports various unit types, including currency, with automatic currency updates and a vast selection of 160 currencies. It offers convenient features like multitasking on iPad, quick access links, and customizable display options for accuracy and rounding. The app provides a user-friendly interface with a dark design and the ability to disable sound and rotation.
This application is a user-friendly tool for swiftly converting units across various metrics, making calculations hassle-free. Try it now for effortless unit conversions on-the-go.
An essential unit conversion tool praised by Macworld Magazine, featuring 76 measurement units across various categories. Easily convert between units like length, weight, temperature, and more with a user-friendly interface and daily exchange rate subscription option for 161 currencies. Effortlessly manage your everyday unit conversions with this intuitive and practical application.
gUnit - Currency is a user-friendly mobile app that provides real-time currency conversion rates, historical data, and customizable alerts. Stay informed about exchange rates and make smart decisions with gUnit - Currency today!
This free app is a versatile unit converter with the ability to convert hundreds of units across various categories, including currency. Users can customize their conversion workflow by hiding unused units and reordering categories. The app is available on iPhones, iPod touches, and iPads.
A versatile conversion calculator app that effortlessly converts various units like length, weight, volume, and more. Simplify your conversions with ease by downloading the app now!
A fast and elegant unit conversion calculator app designed for quick and efficient conversions in various categories including Area and Bits. Experience seamless usability with Mila's Tools PRO Converter for all your conversion needs.
Unit and Currency Converter: Access a comprehensive unit conversion tool featuring a wide range of currencies and units across various categories. Perform calculations with calculators for everyday needs, edit templates, and download user-contributed templates. Keep up-to-date with automatic currency exchange rate updates every 6 hours.
"Effortlessly convert between various units with this beautifully designed app featuring over 100 common conversion units across multiple categories like area, length, temperature, and more. Help us improve by providing feedback and suggestions within the app or via email at gosalapps@gmail.com."