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Best Size Converter Apps

214+ iOS apps curated and reviewed

4.5 avg rating
18 free apps
Updated June 2026

Unit Converter is the household name in size converter, but it's far from the only option. We track 214+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Top Picks for Size Converter

Unit Converter - Best Unit App#1

Unit Converter - Best Unit App by Alan Mrvica

Convert All Units and Currency
Editor's Choice
✈️ Travel
4.8😊(172K ratings)
FreeAdsIn-App Purchases
Unit Converter - Best Unit App screenshot 1
Unit Converter - Best Unit App screenshot 2
Unit Converter - Best Unit App screenshot 3
Unit Converter - Best Unit App screenshot 4
Unit Converter - Best Unit App screenshot 5
Unit Converter - Best Unit App screenshot 6

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.

What We Love

  • 🚀 Easy to use
  • 👍 Comprehensive conversions
  • 💡 Useful for travel and cooking
  • 🚀 Quick and efficient

Room to Improve

  • 🐛 Limited character input
  • 🐛 Difficulty with negative numbers
  • 💡 Lack of ability to quickly switch between conversions
Unit Converter - Pro Units App#2

Unit Converter - Pro Units App by Tue Nguyen Minh

Convert Any Unit
Strong Contender
🔍 Reference
4.6😞(16K ratings)
FreeIn-App Purchases
Unit Converter - Pro Units App screenshot 1
Unit Converter - Pro Units App screenshot 2
Unit Converter - Pro Units App screenshot 3

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!

What We Love

  • 👍 Easy to use
  • 🚀 Simple design
  • 👍 Covers many units
  • 👍 User-friendly layout

Room to Improve

  • 🔒 Limited functionality without paying
  • 🔒 Most common units locked behind paywall
  • 🐛 Restore purchase not working
Convert Any Unit Lite#3

Convert Any Unit Lite by Cider Software LLC

Units & Currency Converter
Worth Considering
✈️ Travel
4.7😊(47K ratings)
FreeAds
Convert Any Unit Lite screenshot 1
Convert Any Unit Lite screenshot 2
Convert Any Unit Lite screenshot 3
Convert Any Unit Lite screenshot 4
Convert Any Unit Lite screenshot 5

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.

What We Love

  • 👍 Easy to use
  • 🚀 Comprehensive unit conversions
  • 💡 Allows custom unit creation
  • 🔧 Useful for cooking, travel, and work

Room to Improve

  • 🔍 Too many unit options can be overwhelming
  • 🔍 Ads can be intrusive and disrupt usage
  • 🐛 Occasional bugs and freezing issues

More Size Converter apps to explore

4
Image Size
Image Size
Image Size
Resize your photo! Resizer App
Free

Resize your photos easily with this app! Customize image sizes in pixels, millimeters, centimeters, or inches and conveniently share the final results. Get precise resizing options and editing tools in just a few simple steps. Unlock special features with in-app purchases for an enhanced experience.

📷 Photo & Video
(30K)
5
Conversion Calculator !
Conversion Calculator !
Conversion Calculator !
Currency, Temperature, Length
Free

Easily convert units of measurement with this user-friendly app. Say goodbye to complex calculations and simplify your unit conversions today!

📊 Productivity
(13K)
6
Size Converter (Lite)
Size Converter (Lite)
Size Converter (Lite)
by nedis
Free

This application helps users convert clothing sizes to international standards, allowing them to easily find their equivalent size in different countries. Simply select your size from a drop-down list, and the app will display the corresponding sizes in various international sizing scales for women and men.

🌟 Lifestyle
(5)
7
Compress Photos & Pictures
Compress Photos & Pictures
Compress Photos & Pictures
Compress photos, save space
Free

An app that reduces the file size of photos without compromising quality, ideal for saving storage space and sharing images more efficiently. Try it now and start saving space on your device!

📷 Photo & Video
(21K)
8
Conversion Calculator Plus
Conversion Calculator Plus
Conversion Calculator Plus
Unit Converter
Free

"Explore the ultimate Unit Converter tool with Conversion Calculator Plus – your go-to Swiss army knife for effortless unit conversions. Simplify complex calculations and streamline your work effortlessly."

📊 Productivity
(15K)
9
Unit Converter HD.
Unit Converter HD.
Unit Converter HD.
30 categories, 700+ units
Free

Discover a powerful unit converter app with 30 categories and over 700 units of measure. Make conversions easily across various categories and save time with this user-friendly tool.

🔧 Utilities
(642)
10
Unit Converter: Mila's Tools
Unit Converter: Mila's Tools
Unit Converter: Mila's Tools
Metric Conversion Calculator +
Free

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!

🔧 Utilities
(1.3K)
11
Converter-Universal Conversion
Converter-Universal Conversion
Converter-Universal Conversion
by Trelleborg Sealing Solutions
Free

"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!"

🔧 Utilities
(897)
12
SizeGo-Clothing Size Converter
SizeGo-Clothing Size Converter
SizeGo-Clothing Size Converter
Convert sizes by brand&region
Free

This application helps users find and compare clothing sizes across different brands and countries, making it easier to shop online or while traveling. With a user-friendly interface and regularly updated data, it provides a simple solution for converting sizes and reducing confusion when buying clothes from various brands and regions.

🔧 Utilities
(3)
13
GlobeConvert Currency & Units
GlobeConvert Currency & Units
GlobeConvert Currency & Units
Convert Currency and Units
Free

Convert currencies quickly and easily with this user-friendly app. Access up-to-date exchange rates and make conversions on the go. Experience convenience at your fingertips. Try it now!

🔧 Utilities
(79K)
14
Units - Pro Unit Converter
Units - Pro Unit Converter
Units - Pro Unit Converter
by Homegrown Software Ltd
Free

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.

🔧 Utilities
(150)
15
Fancy Units Converter
Fancy Units Converter
Fancy Units Converter
Currency and Unit Converter
Free

"Easily convert currencies and units with this user-friendly app for quick and hassle-free calculations. Simplify your conversions now!"

🔧 Utilities
(1.6K)
16
Mila's Unit Converter PRO
Mila's Unit Converter PRO
Mila's Unit Converter PRO
Ultimate conversion calculator
$29.99

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.

🔧 Utilities
(842)
17
Photo Compress - Shrink Pics
Photo Compress - Shrink Pics
Photo Compress - Shrink Pics
Reduce image size & save space
Free

An app that effortlessly reduces image size without compromising quality, perfect for saving storage space and sharing photos quickly. Try it now to streamline your photo sharing experience.

📷 Photo & Video
(3.5K)
18
Convoto - Unit Converter
Convoto - Unit Converter
Convoto - Unit Converter
Super simple and fast
Free

A unit converter app that prioritizes simplicity and usability, featuring clean design and easily readable text. Try it now for quick and hassle-free unit conversions!

🔧 Utilities
(234)
19
Convertible: Unit Converter
Convertible: Unit Converter
Convertible: Unit Converter
Currency and Unit Converter
Free

This application is a comprehensive unit converter that allows users to easily convert between various units of measurement, including standard and non-standard units, across multiple categories such as length, mass, area, and more. With its elegant interface, customizable themes, and unique features like fraction input and output, it helps users visualize and understand complex conversions in a fun and educational way, try it now!

🔧 Utilities
(97)
20
Convert Any Unit
Convert Any Unit
Convert Any Unit
Units & Currency Converter
$9.99

Convert Any Unit is an innovative app that allows users to effortlessly convert various units of measurement. From length and weight to temperature and more, this app offers a user-friendly interface for quick and accurate conversions. Try it now for seamless unit conversions on the go!

✈️ Travel
(5.1K)

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