La unit conversion In school or university time, for some students it can be a real headache, due to its relative complexity and the fact of having to perform various calculations, which are sometimes very extensive and exhausting. If our talent does not reside precisely in the numbers, it is not enough to have an extra help that will get us out of trouble in those distressing moments.
For this reason in this post we collect 4 free unit converters, which do not need to be installed and most importantly, they stand out for being very complete with a great diversity of units and categories 
Drive converters for Windows
1. Converge
Converge is a powerful utility that will help you to easily perform conversions between 1324 units different of measure in 38 categories, which range from Energy, Distance, Temperature, Computing and many more. Its intuitive design allows you to easily select the units of measure you need, to make the conversion in the simplest way.
Something interesting is that it also allows you to edit the conversions or add new units of measurement, which will come in handy. Among the extra tools it includes, we have quick access to the Windows calculator and the conversion editor.
Convert It is a classic heavyweight converters, compatible with Windows and Linux (using Wine virtualization), available only in English but with a fairly simple and intuitive interface. It has a very wide diversity of categories that go from units of measurement of energy, density, volume, speed, temperature, distance, computation and many many others, really very complete.
3. numeral
numeral it is an ideal tool for computer students, as it allows you to specifically convert between systems decimal, hexadecimal, octal and binary, on the base you want. The nice feature is that you just have to write the base system to convert, and you will instantly see the results in the other systems, you don't need to click on any button, the results are in real time 
4. ConvertWorld
Do you prefer an online tool? We also share it with you! ConvertWorld It is a very complete web application, in terms of number of converters and units. It is available in several languages, including our Spanish, where the conversion possibilities are extensive, all divided by categories called "Converters by family".
The advantage of opting for this web tool is that there is no conversion that does not exist in ConvertWorld, the conversions are customizable, that is, you can define their configuration (detailed conversion). It is worth mentioning that using this great web tool is free, however you have the option of registering on the site (free too) to edit settings, access the forum and other advantages.
So far my reader friends, converters for all tastes Which one do you prefer?