This calculator converts ROT-13 (rot13) (rotate by 13 places) notation to standard notation or standard notation to ROT-13 notation.

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- addition
- math operation involving the sum of elements
- algorithm
- A process to solve a problem in a set amount of time
- conversion
- a number used to change one set of units to another, by multiplying or dividing
- notation
- An expression made up of symbols for representing operations, unspecified numbers, relations and any other mathematical objects
- rot-13 conversions
- subtraction
- math operation involving the difference of elements