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Unit Converter - Easy Conversion of Measurements

Unit Converter Screenshot

Quad-Lock Unit Converter is a freeware tool that can take care of all your unit conversions within seconds. It contains more than 1000 units of measurement commonly encountered while solving engineering or everyday conversion problems. It includes a Search function to quickly find units, support for adding custom units, and a smart input box that evaluates calculations & complex expressions. Only the most common units are visible by default (e.g. Area, Distance, Temperature, Velocity) but hundreds more are included and easily found using Search.

Distinctive Features:

  1. Simple & clean user-interface makes the learning curve non-existent to convert most measurements under the sun, even for inexperienced computer users.
  2. Fast and time efficient. There is no need for an installation package, no splash screen, and no silly registration or survey forms. The program is launched in less than a second, a Search function makes it easy to find any unit (even hidden ones), and conversions are performed instantly while typing input.
  3. The program can be run from a USB drive as a completely portable application, without leaving any personal data or registry settings behind.

100% spyware and adware free

Download Beta Version 6.0 for Windows

Please send your suggestions!


Windows 10/7/8/8.1

Beta Version:

6.0 -see updates under Version History below

File Size:

1.54 MB (1,617,920 bytes)

MD5 Hash:




"Outstanding program!

You won't find a better converter than this. This is an excellent program, and I thank the creator of it for sharing it!"
- by mrsfixit on Oct 4, 2010


Pros: I've been wanting a unit converter for years. I've used Download.Com for years for all kinds of programs but only today did I take the time to look for a unit converter and the first one I tried, Quad-Lock Unit Converter 5.3 EXCEEDED my expectations. It is so very simple to use." [..]
- by healerbear on Mar 21, 2008

"Easily one of the most useful utilities to have

Pros: Easy to install - literally takes seconds. Very simple to use. Has pretty much any unit you can think of, and you can always add your own.
Cons: Can't see any cons
Summary: This should come pre-installed on all computers like the calculator does"
- by Lghtspdr, May 22, 2009

"Must have for every day use

Pros: -easy to start and handle
Cons: -no cons at this moment
Summary: -it is exactly what I need and expect"
- by rasvan.barsa, Oct 14, 2008


Pros: Free, you can add your own categories and units. Extremely simple. I added shekels to the mass category, and made my brother the base unit in the category "Stupidity" Fantastic!"  [..]
- by thomasl714 on April 5, 2009


Download Prior Version
Unit Converter 5.4 for Windows

View the Manual (pdf) or send your suggestions!


Manu Mital (THANKS!)




Windows 2000/XP/Vista/7/8/8.1



File Size:

252 kB (258,560 bytes)

MD5 Hash:



Complete Terms of Use

Excerpt: This Site, the Materials and information accessible through this Site and the Software are provided "as is" without any representation or warranty, express or implied, of any kind, and Quad-Lock, its affiliates and their suppliers hereby disclaim all warranties and conditions with regard thereto, including, but not limited to, all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement, and those arising by statute or otherwise at law, or from a course of dealing or use of trade. Quad-Lock does not warrant that this Site or the Software will operate without interruptions or that it will be error free.

: For custom units and preferences to be stored, a small file named UnitConverter.ini (or after the name of your exe file) is written to the %APPDATA%\UnitConverter folder or, if running from a removable drive, to the removable drive's root folder. You can transfer this file to other computers to transfer customizations.

Version History

Version 6.0:

Version 5.4:

Version 5.3:

Version 5.2:

Version 5.1:

Version 5.0: original release