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Convert Units for Free - #1 Unit Conversion App

By John Temple Group Pty Ltd.

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The #1 Unit Conversion App on the App Store since 2009 with over 24 million users to date.

Convert anything easily. This free (yes, free) application lets you convert area, angles, currency, data, density, energy, force, length, mass, mileage, power, pressure, speed, temperature, time, volume, volume flow and more...
You can even create your own unit conversions for anything you want, quickly and easily.

Convert Units for Free is an essential tool that you’ll love and use everyday.

Download the only app with custom conversions and real time currency conversions that are updated live!

"(…) this app is amazingly versatile and user friendly. Unbelievable that it's free. Converts dozens of measurements and types and does so easily for those of us with no mathematical abilities whatsoever. The customizableness (there's a word...!) makes conversions fluid, understandable and remarkably convenient and easy to input. Can't say enough nice things about this app. Thank you for this much needed and often used tool.”
-Adam Schramm

"I would fail geometry without this!"

It doesn’t matter whether you’re a physics student, a cyclist or a plumber, you have conversions to make. You could use a pen and paper or dig out a calculator but why would you? It’s not necessary now that you have Convert Units for Free.

Why tax your brain when you can get conversions in mere seconds, right on your iPhone, iPod Touch or iPad. Need to convert an area or an angle? Want to figure out speed, force or volume? No problem. Convert Units can handle whatever you throw at it and best of all, it won’t cost you a cent. Not now, not ever.

Convert Units for Free is not only powerfully capable, it is also the one and only app offering custom unit conversions. It comes with 13 ready-made categories containing hundreds of conversions for you to use but if you don’t see what you need, just create a new one!

Here are the included categories that are all set up and ready for you:

* Angle
* Area
* Currency* Data
* Energy
* Force
* Length
* Mass
* Power
* Pressure
* Speed
* Temperature
* Time
* Volume

Think an app that can do all this is hard to use? Nope, it’s as easy, user-friendly and intuitive as it possibly can be. You don’t need a degree to be able to take full advantage of Convert Units for Free.

Just check out some of the features!

* User-friendly, extremely intuitive interface
* 14 ready to go categories with hundreds of unit conversions
* Real time currency conversions updated live
* Slidable keypad for larger scroll wheel display
* Unit categories can be sorted and turned on/off
* Allows you to easily create your own custom conversions
* Copy and paste functionality
* Is and always will be 100% free

Come and find out why over 12 million users are already making Convert Units for Free part of their everyday lives. Download this unique, one-of-a-kind application for yourself. It doesn’t cost you anything and may quickly become your most indispensable tool.

Free the Apps! brings you the quality of paid apps for free. We have registered over 37 million total downloads. Your continued support allows us to bring you more updates and apps for free. If you haven't gotten a chance to try out our other top free apps, check them out and spread the word! Thanks! :D

What's New in Version 6.3

Minor bug fixes and adjustments to conversion efficiency.

Remember you can get fast support by emailing us direct on

Convert Units Development Team

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Customer Reviews

Ads Ruined This App

Used to have this app on my iPod touch and loved it, that was way back years ago. Then I got an iPhone 8 gig memory and didn’t have enough room for extras so I didn’t use it for years. Just got a new iPhone 6 with plenty of memory and downloaded it, only to find that EVERY time I open this app a huge full-screen ad appears, WITH sound (and I have no idea how to mute a phone, so it blasts loudly startling everyone around me). Have to wait 6 seconds and watch this annoying full-screen ad play before I can finally close it and use the app!!! Ridiculous! And then there’s a big banner at the top of the app. I looked to see if there was a purchase version of this app that I could download for a buck or two, to get rid of the ads, but there isn’t! So that means I will be deleting this app permanently and finding (or buying for a buck or two) a different app that does the same things but doesn’t blast horrible ads all over the place when you just want to do a quick conversion.

Pop up ads!

This app used to be perfect for my needs, but now there's a mandatory time-restricted ad that pops up upon starting the app that you have to wait a certain number of seconds before skipping. When I need to use the app, I'm typically in a hurry, so this is really annoying and usually just means I leave and try searching google instead. I don't mind small ads on the work screens if it means an app can be free, but the popup ones are a deal breaker. I'm deleting and finding another option.

Does its job well

There's a swap button that haunts you, making you think you can swap the values for convenience.

Swap goes the wrong direction, which means you need to do the math yourself, which defeats the purpose of having an app.

Overall the app is great, especially if you remove the ads. Making a perfect conversion app is hard, and this one is the closest to perfection that I've tried.

Convert Units for Free - #1 Unit Conversion App
View In iTunes
  • Free
  • Category: Utilities
  • Updated:
  • Version: 6.3
  • Size: 6.1 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 5.0 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5.

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Top In-App Purchases

  1. Remove Ads$2.99