Best Metric System Apps

250+ iOS apps curated and reviewed

4.3 avg rating

19 free apps

Updated September 2026

Every iPhone needs a few good metric system apps. We benchmark 250+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Compare top Metric System Apps (September 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	Metric Conversion tool	Free	4.8★ (15K)	No	No	Sep 2026
2	Fraction Calculator	Free	4.7★ (157)	No	Yes	Sep 2026
3	High Plains: Measure Metric	Free	—	—	No	Jul 2026
4	Unit Converter - Best Unit App	Free	4.8★ (193K)	Yes	Yes	Sep 2026
5	Converter (unit conversions)	Free	4.7★ (1.9K)	No	Yes	Aug 2026
6	YORK Chiller Access Manager	Free	1.8★ (11)	No	No	Sep 2026
7	Metric Practice	Free	—	No	No	May 2026
8	Almost Equal To	Free	—	No	No	Aug 2026

Top Picks for Metric System

#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

#2

Fraction Calculator by xNeat.com

Decimal Plus Units Converter

Strong Contender

📊 Productivity

4.7😐(157 ratings)

FreeIn-App Purchases

Fraction Calculator screenshot 1

This tool converts between decimals and fractions, and also handles unit conversions for construction and metric measurements. It offers an intuitive interface for calculations and editing, with advanced features available through upgrades.

What We Love

👍 Intuitive and easy-to-use interface
🚀 Fast calculation performance
💡 Excellent for woodworking and construction projects
🎨 Clean, customizable design with multiple themes

Room to Improve

💰 Extremely expensive subscription model
🔐 Paywall blocks most useful features in free version
😞 Recent update changed from free to paid model

#3

High Plains: Measure Metric by Prakasa Prasetya

Worth Considering

🔧 Utilities

0.0(0 ratings)

Free

More Metric System apps to explore

Unit Converter - Best Unit App

Unit Converter - Best Unit App

Convert All Units and Currency

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.

20 conversion categoriesLive currency updates155 world currencies

free with in-app purchases

Converter (unit conversions)

Converter (unit conversions)

by Brent Royal-Gordon

Easily convert between 76 measurement units across eight common types, including length, weight, temperature, and volume. Features a built-in calculator and optional currency conversion with daily exchange rate updates.

76 measurement units8 common unit typesBuilt-in four-function calculator

free with in-app purchases

YORK Chiller Access Manager

YORK Chiller Access Manager

by Johnson Controls, Inc.

This app provides secure, controlled access to YORK chiller systems. It allows owners to generate dynamic access codes for maintenance and servicing personnel, ensuring visibility and protection of critical facility assets.

Secure access to chiller control panelsGenerate dynamic access codesControl and visibility of users

Metric Practice

Metric Practice

by Carolina Biological Supply

🛍️ Shopping

Almost Equal To

Almost Equal To

Metric – Imperial Converter

Цветы Голландии с доставкой

Цветы Голландии с доставкой

by Vadim Skepkov

This app provides a convenient way to order fresh flowers for delivery across Kaliningrad and its region. Choose from a wide selection of bouquets or customize your own, with options for scheduled delivery and personalized notes. Professional florists are available to assist with selections for any occasion.

Wide flower assortmentCustomizable bouquetsScheduled delivery up to 7 days

🛍️ Shopping

Metric Converters

Metric Converters

Metric Prefix Conversions

Haze Scale: Measure Metric

Haze Scale: Measure Metric

by TASERIYAT NUMANYAT

by Suqian newspaper network media co., LTD

Shiftz Unit: Global Scale

Shiftz Unit: Global Scale

Unit Converter - Convert all

Unit Converter - Convert all

Measurements & Calculations

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.

Real-time currency conversionsExtensive unit categories (weight, temp, length, volume, etc.)Simple and intuitive interface

free with in-app purchases

Falezo Maids: Length Tools

Falezo Maids: Length Tools

by KOCABAS HAKAN KEMAL

Degree Glreds：Unit Manager

Degree Glreds：Unit Manager

by CIFTCI OMER HAKTAN

UnitMate: imperial to metric

UnitMate: imperial to metric

Metric units on D&D Beyond

Automatically converts imperial units to metric units on the D&D Beyond website. This Safari extension works across Mac, iPhone, and iPad, making it easier to use official French D&D sourcebook values.

Converts distances and weights to metricWorks on character, monster, and item pagesSupports Safari on Mac, iPhone, and iPad

📊 Productivity

USA Unit Converter

USA Unit Converter

Widget with Imperial units

Fraction Inch Converter

Fraction Inch Converter

Unit Converter Tool/Difference

FAQ about Metric System

What are the best metric system apps for iPhone?

Metric Conversion tool tops our metric system apps ranking as of September 2026, with a 4.8-star average from 15K App Store ratings, and it's free to download.

Are there free metric system apps for iPhone?

Yes — 19 of the top metric system apps we rank are free to download, including Metric Conversion tool and Fraction Calculator.

Does Metric Conversion tool have ads or in-app purchases?

Metric Conversion tool has no ads and has no in-app purchases, according to its App Store listing as of September 2026.

How many metric system apps are on the App Store?

We track 250+ metric system apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.

What does the Metric Conversion tool app do?

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.

What are the key features of this converter app?

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.