Best Free Unit and Currency Conversion Program


Have you ever needed to convert feet into millimeters without looking for a table, or wanted to convert from one currency unit to another?

These are a few handy and free desktop conversion programs which you might be looking for. If you do not like to install the programs but prefer to use web-based converters, there are also several online converters for conversion of currency or measurement units as well.

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Measurement Unit Converter

ConvertConvert comes with a user-friendly and intuitive interface. It offers pre-defined 21 categories of units and one custom unit which can be defined by users.

The 21 categories include the most popular units of distance, area, volume, volume-dry, mass, density, temperature, time, speed, power, pressure, energy and many others.

To convert a unit into another, just click on a category tab you need, select the input unit and output unit, Convert will show you the conversion result in the output box as you type.

The category tab is customizable. For some conversions that you use the most, you can set them to the front of the tab order, and for some conversions that you may never use, you can hide them to simplify the unit listings. A restart of Convert will bring you to the last conversion you entered.


ESBUnitConvESBUnitConv provides conversion among over 500 units in 20 differernt measurement categories.

Most of the categories are the same as those featured by Convert. However, its category tabs are fixed and not customizable, and it does not have a custom tab for definition by users.


Measurement / Currency Unit Converter

Microsoft Calculator PlusIf you need a unit converter with a currency exchange conversion, Microsoft Calculator Plus may be a good choice. It offers conversion of measurement units in 10 popular categories together with another category for currency exchange.

For currency conversions, you can add currencies to the default list. The program includes a tool to automatically update the exchange rate for the Euro by downloading it from the European Central Bank.

This program can be downloaded free from Microsoft, but it requires Windows Genuine Advantage certification upon downloading.


ConverberConverber is a good alternative for a free unit converter complete with a currency exchange category.

It allows conversions between over 1,200 units of measurement in 33 categories. It gives quite a number of features including; immediate access to all categories or a single category, a favorite to bookmark your frequently-used conversions, an update of currency rates, etc.

It is stated that the currency rates are updated daily in some of its features. If you note that the rates are not updated on first run after installation of the program, you might need to click on 'Help' and 'Check for Updates', or enable the option to check for updates.


Looking for online converters?

Other than the desktop programs, these are a number of web-based unit converters available.

  • Digital Dutch Unit Converter is a good try. It comes with a cleaner web page, instant response and ease of use, with commonly used units available and divided into 16 categories.
  • George Lewe's webMeasure offers conversion of some simple units in linear, area, volume, liquid and weight. In addition, it has paper sizes, numeric systems (including Roman), clothing sizes and a few other miscellaneous measures. It is interesting and worth a try.
  • Web-based currency converters are also available, such as OANDA Currency Converter, one of the popular web tools for currency conversion with daily and historical rates for over 164 currencies, and is available in multi languages.
  • As an alternative, Bloomberg's online Currency Calculator provides intraday data with frequent updates.
  • To cover exchange rates for a selected period of time, Bank of Canada's online 10-year Currency Converter is a good try.


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Quick Selection Guide


Gizmo's Freeware award as the best product in its class!

Runs as a stand-alone program on a user's computer
Convert units in 21 categories, intuitive interface with a custom unit and customizable category tabs.
Currency unit conversion is not included.
153 KB
32 bit but 64 bit compatible
Unrestricted freeware
Win 95 to Win 7


Runs as a stand-alone program on a user's computer
Converts 500 units in 20 measurement categories.
Category tabs are fixed and not customizable. Currency unit conversion is not included.
1.27 MB
32 bit but 64 bit compatible
Unrestricted freeware
A portable version of this product is available from the developer.
v7.4 released 24 August, 2012
Win 98 to Win 7


Runs as a stand-alone program on a user's computer
Convert between over 1,200 units of measurement in 33 categories. Currency exchange category available.
Currency rates are noted not up-to-date on first run after installation.
747 KB
32 bit but 64 bit compatible
Unrestricted freeware
v2.3.1 released 26 April, 2011 View the version history here
Win 98 to XP

Microsoft Calculator Plus

Runs as a stand-alone program on a user's computer
Measurement unit conversion with currency exchange category.
Updating exchange rates for the Euro only.
476 KB
32 bit but 64 bit compatible
Unrestricted freeware
subject to WGA.
Win 95 to Vista

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