Exchange rate calculators are online resources which you use to convert one currency to one other. They usually are available in the form of 'widgets' or programmed graphical user interface (GUI) which routinely calculates the data that the end user inputs in order to provide the desired results.

There are basically two general types of exchange rate calculator that you'd see around - the set exchange rate calculator as well as the universal exchange rate calculator.

The static exchange rate calculator is one which can convert any currency to a fixed currency programmed into the widget. You have to input the second currency that you want to convert into the fixed currency, and the rate of exchange among the two. I find this type of exchange rate calculator rather rough and outdated. People who'd want to use an exchange rate calculator do not normally know the exchange rate that's why they are needing such an application to help them out determine the conversion value of a certain currency. Besides, anyone who understands the rate of exchange might as well do the calculation himself using a standard calculator.

The universal exchange rates calculator is the more established type of exchange rate calculator that you'd see around. Conversion is actually simple. You select the two currencies you want to exchange with each other by simply clicking on them at the 2 drop down menus contained in the widget (one menu for the base currency and the other menu for the end currency). Then you type in the quantity of the base currency you need converted. Click the convert button and you'd get the converted amount in a flash. You absolutely need not enter the rate of exchange on this kind of calculators since they link to real-time data providers. The exchange rate calculator of this kind therefore converts currencies based on the latest exchange rate data originating from its real time provider.

The other important thing that you should understand is that 'not all rates calculators are created equal'! Indeed, that's right, not all exchange rate calculators provide precisely the same conversions. It's as they are subscribed to or are connected to different sources of real time data feed. For requirements of providing an exchange rate calculator, the ideal source to link to would be to a data provider which has links to the interbank market in which banks actually trade with one another using the EBS System (Electronic Brokering System) and the Thomas Reuters Dealing 3000 Xtra System. They are far more reflective of the rates that most banks all over the world use to fix their own forex rates for the day.

Unfortunately it will be hard for us to know which forex rates calculator is linked to a data source provider which has the interbank market in its network. So the logical way to use exchange rate calculator is to expect that you will have some conversion differentials and to make some allowances for such.

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