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Best Metric Converter App

192+ iOS apps curated and reviewed

4.7 avg rating
18 free apps
Updated June 2026

Out of 192+ metric converter app apps on iOS, 18 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Top Picks for Metric Converter App

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
Metric Conversion tool#2

Metric Conversion tool by Wight Hat

Unit and currency converter
Strong Contender
🔍 Reference
4.8😐(15K ratings)
Free
Metric Conversion tool screenshot 1
Metric Conversion tool screenshot 2
Metric Conversion tool screenshot 3
Metric Conversion tool screenshot 4
Metric Conversion tool screenshot 5

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.

What We Love

  • 💡 Useful conversion tool
  • 👍 Easy to use and navigate
  • 🚀 Quick and efficient
  • 👍 Comprehensive coverage of conversions

Room to Improve

  • 🔊 Intrusive and loud ads
  • 🔒 Questionable privacy practices
  • 🐛 Inaccurate conversions
Conversion Calculator !#3

Conversion Calculator ! by oWorld Software

Currency, Temperature, Length
Worth Considering
✈️ Travel
4.6😐(13K ratings)
FreeAdsIn-App Purchases
Conversion Calculator ! screenshot 1
Conversion Calculator ! screenshot 2
Conversion Calculator ! screenshot 3
Conversion Calculator ! screenshot 4
Conversion Calculator ! screenshot 5
Conversion Calculator ! screenshot 6

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

What We Love

  • 🚀 Easy to use
  • 🚀 Comprehensive unit conversions
  • 👍 Helpful app
  • 👍 Practical for engineering and mechanics

Room to Improve

  • 🔍 Too many ads
  • 🔍 Ads make the app unusable
  • 🔍 Ads are invasive and disrupt user experience

More Metric Converter App apps to explore

4
Unit Converter - Pro Units App
Unit Converter - Pro Units App
Unit Converter - Pro Units App
Convert Any Unit
Free

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!

🔍 Reference
(16K)
5
Converter (unit conversions)
Converter (unit conversions)
Converter (unit conversions)
by Brent Royal-Gordon
Free

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.

🔧 Utilities
(1.9K)
6
Convert Any Unit Lite
Convert Any Unit Lite
Convert Any Unit Lite
Units & Currency Converter
Free

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.

✈️ Travel
(47K)
7
Converter+ (Units, Currencies)
Converter+ (Units, Currencies)
Converter+ (Units, Currencies)
Unit and Currency Converter
Free

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.

📊 Productivity
(2.3K)
8
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)
9
CONVERT UNITS
CONVERT UNITS
CONVERT UNITS
Simple unit conversion tool
Free

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.

📊 Productivity
(932)
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
(1.4K)
11
CalConvert: Currency Converter
CalConvert: Currency Converter
CalConvert: Currency Converter
Calculator & Unit Conversion $
Free

Convert currencies easily and efficiently with this intuitive currency converter app. Simply input the amount and select the currencies you want to convert between, making international transactions a breeze. Download now to streamline your currency conversions.

✈️ Travel
(6.4K)
12
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)
13
Unit Converter Calculator Pro
Unit Converter Calculator Pro
Unit Converter Calculator Pro
Simple With Metric & Imperial
Free

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.

🔧 Utilities
(916)
14
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)
15
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)
16
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)
17
Converter: US-Metric Units
Converter: US-Metric Units
Converter: US-Metric Units
Lb-Kg, Cm-Inch, Mi-Km and more
Free

This conversion tool allows users to easily switch between US and metric units for weights, lengths, volumes, and temperature, with a simple interface that requires no instructions. With automatic conversion history saving, users can review past conversions and perform new ones with just a few clicks.

🔧 Utilities
(4)
18
CalConvert: Pro Calculator $€
CalConvert: Pro Calculator $€
CalConvert: Pro Calculator $€
Currency Metric Unit Converter
$24.99

Download CalConvert: Pro Calculator for a versatile Currency Metric Unit Converter experience. Simplify calculations and conversions effortlessly.

💰 Finance
(295)
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
Conversion Calculator Units
Conversion Calculator Units
Conversion Calculator Units
Unit Conversion Calculator All
Free

This app is a handy conversion calculator with 12 categories for quickly converting units. Simplify your conversions with ease!

🔧 Utilities
(4.8K)

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