ROT13 Calculator
Calculate ROT13 transformations instantly with our powerful online tool. Encode or decode text with a single click.
ROT13 is a special case of the Caesar cipher where each letter is rotated by 13 places. This calculator provides real-time ROT13 conversion with detailed statistics about your text transformation.
Instant Calculation
Get ROT13 transformations in real-time with performance metrics showing exactly how long the calculation took.
Detailed Statistics
Track character counts, transformed letters, and unchanged elements with our comprehensive stats dashboard.
Private Processing
All calculations happen in your browser - your text never leaves your computer or is stored anywhere.
About ROT13 Calculation
How ROT13 Works
ROT13 replaces each letter with the one 13 positions after it in the alphabet. For example, 'A' becomes 'N', 'B' becomes 'O', and so on. The calculation wraps around after 'Z' back to 'A'.
Calculation Method
Our calculator uses the formula: (charCode - base + 13) % 26 + base where base is 65 for uppercase and 97 for lowercase letters. This ensures accurate rotation calculation.
Technical Details
The tool measures exact calculation time in milliseconds and provides detailed statistics about your text transformation for analysis and verification purposes.