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Unit Converter - Best Unit App

Unit Converter - Best Unit App

Convert All Units and Currency

193K ratings
1688 reviews
With Ads#78 in top-grossing Travel
🔧 Utilities
✈️ Travel
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • March 26, 2013
  • December 2, 2025

Features

Developer

Alan Mrvica
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Unit Converter - Best Unit App screenshot #1 for iPhone
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Unit Converter - Best Unit App screenshot #9 for iPhone
Unit Converter - Best Unit App screenshot #10 for iPhone
iphone
ipad
📈no. 78
Charts↘︎
📌Ready
Reviews summary↘︎
⭐1.7K
Reviews↘︎
📝40+ tags
Tags↘︎
🔄6+ apps
Alternatives↘︎
❓5 answered
FAQ↘︎
📦w/o updates
Updates frequency↘︎
🖼️Get Icon
Icons↘︎

About

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 categories
✓Live currency updates
✓155 world currencies
✓Daily exchange rate refresh
✓Simple and beautiful design
✓Swap units functionality
Show original description

What users say

Summarized from real user reviews of Unit Converter. Based on 193K reviews and a 4.8/5 average, it highlights the 5 positives and 4 negatives reviewers mention most about this Travel app.

Positive things

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

Negative things

  • 🐛Limited character input
  • 🐛Difficulty with negative numbers
  • 💡Lack of ability to quickly switch between conversions
  • 💰Pro version not worth the cost
See all reviews

What's New in Unit Converter

10.2

December 2, 2025

Fixed typo error in Weight category

8

Subscriptions & In-App Purchases

Premium

Unlimited Access to All Features for 1 Year

$24.991 Year
7 Days trial
How to cancel Unit Converter subscription ⁉️

Charts

Top Grossing

📈 78+14

Travel

This app rose +14 positions in Travel chart.

Last updated on October 13, 2026.

User reviews

Most RecentHighest RatedLowest Rated

Not Able to Input

I wasn't able to input the numbers! And as soon as I pressed any button thy looked like support, it went to an ad.
CalGalTerriCalGalTerri

Locks up

After one use it filled the screen with an advertisement that couldn’t be cleared off.
I’d gladly pay for an ax free version.
OldmercsOldmercs

Darcy

It doesn’t weigh anything. It takes pics of whatever you’re trying to weigh but doesn’t give you a weight.
Darcy Simpson 1970Darcy Simpson 1970

Never fails

I’ve been using this app for years and it’s still my go-to. It’s basic and still simple to use.
gigemchick06gigemchick06

Love this app

Use it all the time. Great app!
Love Wells Fargo ApLove Wells Fargo Ap
See 1683 more reviews

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User experience

🐞

Reported Bugs

2 issues

Forced 5-star review prompt

Bug

Inaccurate weight/stone conversion

Bug
✨

Requested Features

3 requests

Add calorie/kJ conversion

Feature

Allow negative number input

Feature

Improve ability to quickly switch between conversions

Feature

FAQ

What does this app do?

This app is a comprehensive unit and currency converter. It allows you to convert between a wide variety of units across 20 different categories, such as length, weight, temperature, and area. It also provides live updates for currency exchange rates for 155 world currencies.

What are the key features of this unit converter?

Key features include conversion for 20 categories of units, live daily updates for 155 world currencies, a simple and beautifully designed interface, and the ability to easily swap units with a button press on the keypad.

How does the currency conversion work and is it free?

Currency exchange rates are downloaded once a day when the app is opened, requiring an internet connection. Each download uses a very small amount of data. The app is free to download and use, but may offer in-app purchases or contain ads.

What types of units can I convert?

You can convert units across 20 categories including Angle, Area, Currency, Data (computer and network speed), Energy, Force, Fuel-Mileage, Length, Pants, Power, Pressure, Shoes, Speed, Temperature, Time, Tops-Clothing, Torque, Volume, and Weight-mass.

Is an internet connection required to use the app?

An internet connection is required to download the daily currency exchange rates. Once downloaded, you can perform unit conversions offline. The data usage for currency updates is minimal, around 1-2kb per download.