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Best Free Metric Conversion Tool Apps

250+ iOS apps curated and reviewed

4.8 avg rating
18 free apps
Updated August 2026

The best free metric conversion tool apps on iPhone average 4.8★ 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★ (191K)YesYesAug 2026
3Unit Converter - Convert allUnit Converter - Convert allFree4.6★ (13K)YesYesAug 2026
4Convert Any Unit LiteConvert Any Unit LiteFree4.7★ (47K)YesNoAug 2026
5Almost Equal ToAlmost Equal ToFree—NoNoMay 2026
6Imperial - Metric ConversionsImperial - Metric ConversionsFree—NoNoMay 2026
7Haze Scale: Measure MetricHaze Scale: Measure MetricFree—YesNoJul 2026
8Shiftz Unit: Global ScaleShiftz Unit: Global ScaleFree—YesNoMay 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😊(191K 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

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
(47K)
ad-supported
5
Almost Equal To
Almost Equal To
Almost Equal To
Metric – Imperial Converter
Free
🔧 Utilities
(0)
6
Imperial - Metric Conversions
Imperial - Metric Conversions
Imperial - Metric Conversions
Imperial to Metric Units
Free
📊 Productivity
(0)
7
Haze Scale: Measure Metric
Haze Scale: Measure Metric
Haze Scale: Measure Metric
by TASERIYAT NUMANYAT
Free
🔧 Utilities
(0)
8
Shiftz Unit: Global Scale
Shiftz Unit: Global Scale
Shiftz Unit: Global Scale
by Olmez Sabri
Free
🔧 Utilities
(0)
9
Precision Metric - Converter
Precision Metric - Converter
Precision Metric - Converter
by Eastchester Group Ltd
Free
🔧 Utilities
(0)
10
High Plains: Measure Metric
High Plains: Measure Metric
High Plains: Measure Metric
by Prakasa Prasetya
Free
🔧 Utilities
(0)
11
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
12
Grit Sphere: Measure Auditor
Grit Sphere: Measure Auditor
Grit Sphere: Measure Auditor
by Christopher D Thomas
Free
🔧 Utilities
(0)
13
AAA Conversion
AAA Conversion
AAA Conversion
All-In-One Unit Converter
Free
🔧 Utilities
(0)
14
Unit Conversion - Pro
Unit Conversion - Pro
Unit Conversion - Pro
Convert anything, anywhere
Free
📊 Productivity
(0)
15
Harvest Hearth: Unit Feet
Harvest Hearth: Unit Feet
Harvest Hearth: Unit Feet
by Prakasa Prasetya
Free
🔧 Utilities
(0)
16
Length Measure Converter
Length Measure Converter
Length Measure Converter
Fast & Easy Unit Conversion
Free
📚 Education
(0)
17
Millimeters to Inches
Millimeters to Inches
Millimeters to Inches
by Thomas Pelster
$0.99

Easily convert measurements between millimeters and inches in either direction. This utility app is straightforward to use, requires no internet connection, and offers a clean, ad-free experience.

Millimeter to Inch conversionInch to Millimeter conversionEasy to use interface
🔧 Utilities
(1)
paid
18
Metric Converters
Metric Converters
Metric Converters
Metric Prefix Conversions
$0.99
🔧 Utilities
(0)
19
Tension Conv: Node Platform
Tension Conv: Node Platform
Tension Conv: Node Platform
by Antonio Quihui
Free
🔧 Utilities
(0)
20
Fraction Inch Converter
Fraction Inch Converter
Fraction Inch Converter
Unit Converter Tool/Difference
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.