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Best Free Metric Conversion Tool Apps

250+ iOS apps curated and reviewed

4.2 avg rating
18 free apps
Updated August 2026

The best free metric conversion tool apps on iPhone average 4.2★ across 250+ titles — we've ranked them by what real users actually keep on their phones. Updated August 2026.

Compare top Free Metric Conversion Tool Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Metric Conversion toolMetric Conversion toolFree4.8★ (15K)NoNoAug 2026
2Unit Converter - Best Unit AppUnit Converter - Best Unit AppFree4.8★ (192K)YesYesAug 2026
3Unit Converter - Convert allUnit Converter - Convert allFree4.6★ (13K)YesYesAug 2026
4Convert Any Unit LiteConvert Any Unit LiteFree4.7★ (48K)YesNoAug 2026
5Unit ConverterUnit ConverterFree4.8★ (13)YesYesAug 2026
6High Plains: Measure MetricHigh Plains: Measure MetricFree——NoJul 2026
7Metric ConvertersMetric Converters$0.99—NoNoAug 2026
8Imperial - Metric ConversionsImperial - Metric ConversionsFree—NoNoMay 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
Unit Converter - Best Unit App#2

Unit Converter - Best Unit App by Alan Mrvica

Convert All Units and Currency
Strong Contender
✈️ Travel
4.8😊(192K ratings)
FreeAdsIn-App Purchases
#79in 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

Room to Improve

  • 🐛 Limited character input
  • 🐛 Difficulty with negative numbers
  • 💡 Lack of ability to quickly switch between conversions
Unit Converter - Convert all#3

Unit Converter - Convert all by oWorld Software

Measurements & Calculations
Worth Considering
✈️ Travel
4.6😐(13K ratings)
FreeAdsIn-App Purchases
Unit Converter - Convert all screenshot 1
Unit Converter - Convert all screenshot 2
Unit Converter - Convert all screenshot 3
Unit Converter - Convert all screenshot 4
Unit Converter - Convert all screenshot 5
Unit Converter - Convert all screenshot 6

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.

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 Free Metric Conversion Tool apps to explore

4
Convert Any Unit Lite
Convert Any Unit Lite
Convert Any Unit Lite
Units & Currency Converter
Free

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.

Intelligent unit search with autocompleteAutomatic category selectionIntegrated calculator
✈️ Travel
(48K)
ad-supported
5
Unit Converter
Unit Converter
Unit Converter
Conversion Calculator
Free

This app offers a wide range of unit conversions for various measurements, from temperature to length. It features a user-friendly interface, customizable themes, and smart features that remember your frequent conversions. It also links to external apps for specialized tasks.

Broad conversion spectrumPersonalizable themesUser-friendly interface
🔧 Utilities
(13)
free with in-app purchases
6
High Plains: Measure Metric
High Plains: Measure Metric
High Plains: Measure Metric
by Prakasa Prasetya
Free
🔧 Utilities
(0)
7
Metric Converters
Metric Converters
Metric Converters
Metric Prefix Conversions
$0.99
🔧 Utilities
(0)
8
Imperial - Metric Conversions
Imperial - Metric Conversions
Imperial - Metric Conversions
Imperial to Metric Units
Free
📊 Productivity
(0)
9
Length Mass Speed Converter
Length Mass Speed Converter
Length Mass Speed Converter
15 measurements categories
Free

Easily convert between various units of measurement across 15 categories, including length, mass, volume, speed, and temperature. Offers a premium subscription for advanced features and an ad-free experience.

Distance/length conversionsArea conversionsVolume conversions
🔧 Utilities
(14)
free with in-app purchases
10
Metric Practice
Metric Practice
Metric Practice
by Carolina Biological Supply
Free
🛍️ Shopping
(0)
11
Almost Equal To
Almost Equal To
Almost Equal To
Metric – Imperial Converter
Free
🔧 Utilities
(0)
12
Falezo Maids: Length Tools
Falezo Maids: Length Tools
Falezo Maids: Length Tools
by KOCABAS HAKAN KEMAL
Free
🔧 Utilities
(0)
13
Precision Metric - Converter
Precision Metric - Converter
Precision Metric - Converter
by Eastchester Group Ltd
Free
🔧 Utilities
(0)
14
Shiftz Unit: Global Scale
Shiftz Unit: Global Scale
Shiftz Unit: Global Scale
by Olmez Sabri
Free
🔧 Utilities
(0)
15
Metric Converter Pro
Metric Converter Pro
Metric Converter Pro
Quick Unit Converter
$2.99

This tool offers instant unit conversions without clutter or ads. It features a one-screen design for quick input and results, supporting a wide range of smart unit groups and common metric and imperial units. It works offline and is ideal for everyday use, travel, work, and school.

One-screen input and result displayInstant conversion while typingSmart unit groups
📊 Productivity
(0)
paid
16
AAA Conversion
AAA Conversion
AAA Conversion
All-In-One Unit Converter
Free
🔧 Utilities
(0)
17
Unit Conversion - Pro
Unit Conversion - Pro
Unit Conversion - Pro
Convert anything, anywhere
Free
📊 Productivity
(0)
18
Engineers Toolbox
Engineers Toolbox
Engineers Toolbox
by Charles Crawford
Free

This utility app offers essential conversion functions for common engineering units like distance, area, volume, pressure, and weight. It allows users to save default units for faster, repeated conversions without re-selecting them each time.

Distance conversionArea conversionVolume conversion
🔍 Reference
(1)
free
19
Grit Sphere: Measure Auditor
Grit Sphere: Measure Auditor
Grit Sphere: Measure Auditor
by Christopher D Thomas
Free
🔧 Utilities
(0)
20
Unitify - Unit Conversion
Unitify - Unit Conversion
Unitify - Unit Conversion
Unit conversion
Free
🔧 Utilities
(0)

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 August 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 August 2026.
We track 250+ free metric conversion tool apps on the iOS App Store as of August 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.