Alternate Calculator is a freeware calculator that has different numbers and currency conversions.
The interface looks essentially like any other calculator, and the window can be resized to a rectangle or full screen, taking up as much, or little, space as you like. You can also change the colors.
Alternate Calculator has two primary features that it is designed around. The first is currency translations, with a total of eleven currencies currently supported. We assume this might change over time. The other primary feature is the conversion between different number formats. These are found at the top and are decimal, hexadecimal, binary, and customer-defined.
One missing feature is the numerical keypad. That's the numbers to the bottom right of your keyboard. You need to use the numbers across the top of your keyboard.
All told, the Alternate Calculator is a calculator for anyone, but especially if you need numbers and currency conversions.