Using Calculator Mode
Calculator mode allows you to perform any of the standard operations for which you would normally use a handheld calculator.
Using Currency Mode
Tap the 
button on the calculator screen to switch to Currency mode.
Tap the down arrow next to the input field to display a list of currencies and select the currency to convert from. Tap the down arrow next to the output field to display a list of currencies and select the currency to convert to.
Enter the currency value in the input field by tapping the number buttons on the numeric keypad. The converted currency immediately appears in the output field.
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