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Best Free Metric Conversion Tool Apps

249+ iOS apps curated and reviewed

4.7 avg rating
19 free apps
Updated September 2026

The best free metric conversion tool apps on iPhone average 4.7★ across 249+ titles — we've ranked them by what real users actually keep on their phones. Updated September 2026.

Compare top Free Metric Conversion Tool Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Metric Conversion toolMetric Conversion toolFree4.8★ (15K)NoNoSep 2026
2Unit Converter - Best Unit AppUnit Converter - Best Unit AppFree4.8★ (193K)YesYesSep 2026
3Convert Any Unit LiteConvert Any Unit LiteFree4.7★ (48K)YesNoSep 2026
4Unit Converter - Convert allUnit Converter - Convert allFree4.6★ (13K)YesYesSep 2026
5Conversion Calculator - MetricConversion Calculator - MetricFree4.8★ (157)NoYesSep 2026
6High Plains: Measure MetricHigh Plains: Measure MetricFree——NoJul 2026
7Metric ConvertersMetric Converters$0.99—NoNoSep 2026
8Almost Equal ToAlmost Equal ToFree—NoNoAug 2026

Top Picks for Free Metric Conversion Tool

Metric Conversion tool#1

Metric Conversion tool by Wight Hat

Unit and currency converter
Editor's Choice
🔍 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

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.

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
  • 👎 Disruptive to workflow
Unit Converter - Best Unit App#2

Unit Converter - Best Unit App by Alan Mrvica

Convert All Units and Currency
Strong Contender
✈️ Travel
4.8😊(193K ratings)
FreeAdsIn-App Purchases
#75in Travel
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

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.

What We Love

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

Room to Improve

  • 🐛 Limited character input
  • 🐛 Difficulty with negative numbers
  • 💡 Lack of ability to quickly switch between conversions
  • 💰 Pro version not worth the cost
Convert Any Unit Lite#3

Convert Any Unit Lite by Cider Software LLC

Units & Currency Converter
Worth Considering
✈️ Travel
4.7😊(48K ratings)
FreeAds
Convert Any Unit Lite screenshot 1
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Convert Any Unit Lite screenshot 3
Convert Any Unit Lite screenshot 4
Convert Any Unit Lite screenshot 5

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.

What We Love

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

Room to Improve

  • 🔍 Too many unit options can be overwhelming
  • 🔍 Ads can be intrusive and disrupt usage
  • 🐛 Occasional bugs and freezing issues
  • 🔋 High ad frequency drains battery quickly

More Free Metric Conversion Tool apps to explore

FAQ about Free Metric Conversion Tool

What are the best free metric conversion tool apps for iPhone?
Metric Conversion tool tops our free metric conversion tool apps ranking as of September 2026, with a 4.8-star average from 15K App Store ratings, and it's free to download.
Metric Conversion tool has no ads and has no in-app purchases, according to its App Store listing as of September 2026.
We track 249+ free metric conversion tool apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
The app is a comprehensive unit and currency converter. It allows users to convert between a vast number of units, including weight, temperature, length, area, volume, speed, time, angle, pressure, and currency. It aims to provide accurate conversion results with a user-friendly interface.
Key features include an easy-to-use interface, offline functionality, support for over 30,000 unit conversions, and over 160 currencies with live exchange rates. It also allows users to store favorite conversions for quick access and provides answers in fractions where needed, with results up to 5 decimal places.