The buttons
| to | Input digits |
| or | Decimal separator |
| Removal of last input: digits, decimal separator or operator | |
| Clear all: both input and result area | |
| or | Validation of input number considered as a value expressed in the reference currency (euro or dollar) |
| The button labeled with the name of an other currency | Validation of input number considered as a number in the other currency |
| Validation of input number considered as a simple, unitless, value | |
| Validation of input number considered as a percentage | |
| Change sign of the result | |
| , , and | Store result in memory, recall memory into result, add result to memory and subtract result from memory |
| , , and | Operators: addition, subtraction, multiplication and division |
| Reset both input, result and memory | |
| Displays the About box | |
| Displays these help pages | |
| The drop down list with currency codes and names | Selects an other currency to work with |
