Units is a really useful app that lets you easily convert from various units into lots of others.

NEW: Units now supports doing quick conversions on Apple Watch. Perfect for currency conversions on holiday, or any other calculations you need to do quickly throughout your day.

Units can convert hundreds of units from 43 different categories including Speed, Time, Length, Volume, Area, Power, Temperature, Fuel Consumption, Shoe Sizes and loads more!

Units is now a fully universal app with native support for iPhones, iPod touches and iPads.

As an added bonus, Units also has a built in ruler, for doing small, quick measurements when the need arrises.

• Convert hundreds of units - Units has over 800 units across 43 different categories.
• Convert currency - Units can convert between 88 different currencies, with rates updated daily.
• Hide unused units - Units lets you hide units you don't use, allowing you to maintain a streamline conversion workflow.
• Built in ruler - Units has a built in ruler allowing you to make small, quick measurements without carrying round a ruler.

Also available: Units Premium disables adverts and allows you to reorder both units and unit categories to suit your needs.

What’s New

Version 2.4.1

This app has been updated by Apple to use the latest Apple signing certificate.

Fixed a crash affecting iOS 7 users.

Ratings and Reviews

3.4 out of 5
94 Ratings

94 Ratings

a user489 ,

Good, would like to see a couple of additions

I like the layout because it shows all the conversions in one view and i can adjust which ones I want to see in the table. I would like to see more options, however; for example, “cubic feet per second” and “acre-feet” are common in hydrology in the US (good to add metric alternatives such as “cubic meters per second”).

Hammontre ,

Really useful

I have been using the iPhone since the first model was released, and this app is one of the first I installed when the App Store opened to third party developers. I've consistently used it since then, and over the years it's become the only app I use for any conversions. Currency is great for travel and online shopping, and all the other conversions will come in handy at the most unexpected times. It's also useful to have the ruler for getting a rough idea of size. (I'm not good at visualizing 3", for example.)

This app had some technical issues a while back, but they seem to be resolved. Despite this app not having an update since 2015, it still works great on my 6S+ running the most current OS. I hope the developer hasn't abandoned the app, because I've never found one that's so simple, comprehensive and affordable. I'm keeping my fingers crossed that they'll come back if needed. Until the app is definitely abandoned and no longer working, I highly recommend this app. It's been on the main screen of every single iPhone I've owned


Cry babies

Everyone who really likes the app and left one star because of technical issues that they more than likely were unaware of, are a bunch of crybabies! And the other crybabies whining about the ruler, come on now give me a break, get a ruler this is a converter app! The only person that has a valid complaint is of the climber and I hope they fix the issue for you other than that this is a pretty good app. I have been using it for years and it hasn't disappointed me yet. To be honest the ruler is kind of stupid. but maybe that's because I have measuring tapes in at least three of the rooms in my house

App Privacy

The developer, Homegrown Software Ltd, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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