• Convert Units for Free 1
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Convert Units for Free

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!

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* "(…) 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

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* "I would fail geometry without this!" -Aroga

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

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Reviews (30)

Bre. L. Jun 30, 2019     

Too many ads, another one pops up every time the window is opened

AMB. Dec 4, 2019     

Too much ads to much crashes

Ale. D. Nov 13, 2019     

Used to be my go to but now it is just plagued with ads

Wou. v. d. H. Aug 29, 2019     

Allways handy to have, great app. Thx

Zak. I. J. Jul 28, 2019     

Alhamdulillah, Very helpfull apps. May Allah accept yours..

Anz. C. Dec 13, 2019     

Good app. I use it for years.

Des. W. Aug 14, 2019     

This app is so convient to use.

Tre. Aug 12, 2019     

The beat out there....

Jay. H. Jan 21, 2018     

I really like the app in premise, and have found it quite useful. But the mileage conversion doesn't work at all (should be an inverse relationship.) To bypass this, I set up a custom conversion in the app. That more or less works, but it displays incorrectly (looks like it's converting from L/100km to L/100km, when it's actually converting to MPG as I intended.) Hopefully those are the only issues, aside from a steady barrage of ads, but it does make you question how many other conversions might be flawed.

Kas. S. Dec 30, 2015     

Good layout, although the side menu popup is a bit touchy when changing units. However, the description is a flat out lie. This app is not "completely free" as described. It has ads and an in-app purchase ($1.99) to remove them. There's also a premium version in-app purchase. Now, I know the devs need their money, but please don't lie about being ad-supported.

Dav. V. Dec 20, 2017     

Garbage. I tried using this. In 4 minutes I was got 3 ads, 2 crashes, 1 rating request, and 0 successful conversions. After responding to their feedback request, I finally found the app doesn't even know how many square feet are in one acre (it's 43,560). Fail!

Pet. A. Dec 6, 2017     

The mileage conversions are wrong. Try converting between litres per 100 km and miles per gallon and you'll see what I mean.

Sim. M. Dec 29, 2015     

The conversion between mpg and l/100km does not work. The conversion is not a simple scale factor as the higher the l/100km the lower the mpg.

Hum. J. Jun 5, 2016     

Useful as it has less of units and to can also make your own custom unit. But the problem is there are too many ads, sometimes it's stops working and or would be better if the atop would stay on the unit we were on before

A. G. u. Aug 27, 2017     

Brilliant app, just changed from iPhone to Samsung and was so pleased that I could still get this app for Android. Have installed it on every device I have, it's really handy to have.

Kar. W. Jun 24, 2016     

Does this app not realise there are 14 pounds in a stone. Basic weight function and it doesn't work

Hea. U. Mar 28, 2017     

This app is so handy I've installed it on every phone and IOS device I own. I'm actually shocked that most devices don't come equipped with this app from the factory, like they usually do with the clock and weather apps.

Ker. T. Dec 10, 2015     

I think so highly of this app that I have it installed on my Apple and Android Products. Works just as well on both types of OS, which would be without issues in my experiences with the app! For FREE cant go wrong!

Muh. B. Sep 24, 2016     

Work like i chime for 10 minits then keep crashing. Samsung note3. Upto date software. 😠

D.B. C. Mar 27, 2016     

Unprofessional annoying startup screen, no energy efficient dark theme, pester screens and heavily burdened with ads make this app mostly unusable.

Ald. B. Jan 1, 2017     

I like the app Zbigniew pretty intuitive interface, I'll be looking forward to use it more on my daily basis.

Jul. E. Jan 9, 2016     

I have this app in an iphone too. In my Note5 I tried to upgrade but it fails with "error, authentication required, log in into your google account"

Mar. B. Jun 16, 2017     

Cool app. I used this one on other OS devices. However I wish to remove ads but says it requires me to open my Google account. Need help. Please

Tob. F. Aug 13, 2018     

Good app, expect for the ads. I hate that. Try to upgrade, but it keeps bringing up an error message. If that was fixed, and I didn't have to view all those meaningless ads that I don't care about, I would give it a better rating.

ckZ. Jul 13, 2017     

Open app. 10 seconds later I need to review it. Obnoxious ads. Uninstall

Off. D. Dec 27, 2015     

I love this app, would really recommend getting, fills in a gap that Google missed out

Mat. B. Jul 15, 2017     

App doesn't even open. Just goes to a white screen and you have to quit it completely.

W-T. S. Nov 21, 2017     

GREAT app! I've had it for years, and always will now. Conversions come up all the time, and since I've been using this, I've learned most of the common ones I use, but I still come to this app to verify.

Dan. H. Oct 5, 2017     

Great app yes a few adds but come on we don't go to work for fun do we. To the idiot who rated it 1 star check your not looking at troy lbs what a donkey

A. G. u. Oct 22, 2017     

The best conversion app I've come across to date. So easy to use and surpasses many other applications.