Over 4 million downloads! The FASTEST way possible to convert units. Just type in a unit without first selecting the category. As you type, a list of units appear. Tap a unit to select it. For most units, 1 or 2 letters is enough to find the unit you want. Automatically saves units into a Favorites list. This version is ad-supported.


As you type, the most likely units appear. Once you have selected a unit, the other unit is automatically restricted to the category of the current unit. At any time you can browse through the complete list of units available by tapping on the buttons to the right of the input fields. Advanced features include bookmarks and an integrated calculator. With over 6,400 units, this is the only unit converter you will ever need.


Streamlined Interface

• Search for and select units with autocomplete (as you type, a list of matching units appears).
• Search faster by typing in only the unit abbreviation or first letter of each word in the unit.
• "Intelligent Search" shows the most likely units first.
• Automatic category selection (category is automatically set once you select a unit).
• Flip Units button to switch the From and To units.
• Reset button to clear all inputs and start over.
• Convert to fraction.


Advanced Features

• Built in calculator.
• Save bookmarks and organize them into folders.
• Equations are shown for temperature conversions.
• Copy and paste to and from the clipboard.
• Conversion result is shown as an easy to understand equation.
• Both unit names and symbols shown.
• Browse units in an alphabetically indexed list or by magnitude.
• Results with up to 12 significant digits.
• Automatic formatting of numbers based on your current Region Format.
• Automatic formatting of extremely large or small numbers with scientific notation.


Over 6,400 Units In 51 Categories.

• Acceleration
• Angle
• Area
• Blood Cholesterol
• Blood Glucose
• Capacitance
• Currency
• Currency / Volume
• Data
• Data Rate
• Density
• Dynamic Viscosity
• Electric Charge
• Electric Current
• Electric Potential
• Electrical Conductance
• Electrical Resistance
• Energy
• Force
• Frequency
• Fuel Economy
• Illuminance
• Inductance
• Kinematic Viscosity
• Length
• Luminance
• Magnetic Field Intensity
• Magnetic Flux
• Magnetic Flux Density
• Mass
• Mass / Area
• Mass Flow
• Mass Fraction
• Mass Moment of Inertia
• Mole Fraction
• Numeral Systems
• Pace (Speed)
• Power
• Pressure
• Radiation - Absorbed Dose
• Radiation - Equivalent Dose
• Radiation Rate - Equivalent Dose
• Radioactivity
• Sound
• Speed
• Temperature
• Time
• Torque
• Volume
• Volume / Area
• Volume Flow
• Volume Flow / Area
• Water Hardness
• Weight (Mass)
• Wire Gauge

URL Scheme: convertanyunitfree://

What's New

Version 6.1

- Added 2 new unit categories (Mass / Area, Volume Flow / Area).
- Added new unit (boiler horsepower).
- Fixed issues with bookmarks.

Ratings and Reviews

4.6 out of 5
19.2K Ratings
19.2K Ratings
JustANormalUser463758 ,

Long-time user now stuck with mediocre “Lite” Version

I’ve had this app for over 5 years and have used the currency in multiple countries (e.g. China, Mexico, Canada, Italy, Ireland, etc). I also used this app mainly to convert units of measurement while cooking. Now, I find out that even though I have been a loyal user across many years, I am stuck watching ads before I can even select a unit of conversion. I don’t mind an occasional ad banner or two, but when you’re traveling to areas with low poor connection, it makes a world of difference. It is also frustrating to know that the privileges I had a free member are now available for a price in the App Store, since it is now required to pay to go beyond the “Lite” version. I had the app before there was a Lite version, and have been a loyal user through many changes and updates. This is not a good way to retain users, and frankly, I’m not sure I want the app anymore. This has left a bad taste in my mouth.

Developer Response ,

It's still the same app as before, only the icon has been changed to comply with a new rule by Apple.

Steelersfan71 ,

Converting Made Easy!

This is the first conversion app I ever tried.. And I Haven't even thought about trying another! It's handled every single thing I've thrown at it! Once in a while when I get a brain fart and start struggling with the name and/or definition of a particular unit all I have to do is let the app guide me through the fog I've created for myself! It gives great information to help people understand exactly what they're looking for! The only errors that have come up with this app have been operator errors! I'm a lifer with this app!


Incredibly Useful App

I use this app all the time and I've yet to find a unit it does not have. I constantly need to convert weight, length and volume to and from metric in the shop and this app does it all. Add to this the currency conversions ..... can't praise this app enough.

Update: Two years later and this app is even better. Haven’t found a unit it doesn’t include yet and I should add that the ads in the lite version are the most non-intrusive of any app I’ve ever used.

I really can’t think of any way in which it could be improved.


Cider Software LLC
32.1 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2011-2018 Cider Software LLC


  • Family Sharing

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

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