Letter to Number Converter: Fast and Fun Tool

How the mapping works

Each letter is assigned its position in the alphabet: A/a = 1, B/b = 2, all the way to Z/z = 26. The tool lowercases each character and subtracts 96 from its character code (lowercase "a" is character code 97, so 97 − 96 = 1) to get that position. Anything that isn't a letter — spaces, digits, punctuation — is flagged as "(not a letter)" instead of getting a number.

Worked example

Type "cat" and the tool returns: c = 3, a = 1, t = 20. Type "hi!" and you get h = 8, i = 9, ! = (not a letter), since the exclamation mark isn't in the alphabet.

Where this is used

This letter-to-number scheme (A1Z26) shows up in basic substitution ciphers, word puzzles, numerology exercises, and as a teaching example for how character encoding works before students move on to full ASCII or Unicode code points. It's not a security cipher — it's the same fixed mapping every time, so it offers no actual encryption strength.

Case sensitivity

Uppercase and lowercase letters return the same number: both "A" and "a" convert to 1, since the tool normalizes to lowercase before calculating the position.