Home › Converters › Letter to Number Converter

Letter to Number Converter

Convert text to alphabet positions (A=1, B=2, … Z=26) and convert number sequences back to letters. Used for puzzles, ciphers, classroom activities and simple codes.

The A1Z26 system

Each letter is replaced by its position in the alphabet: A=1, B=2, C=3 … Z=26. So "CAT" becomes 3-1-20. It is one of the oldest simple substitution ciphers and a staple of puzzle hunts and escape rooms. Choose your separator (space, dash or none) and direction above; spaces between words are kept as word breaks in number mode.

Frequently Asked Questions

What number is the letter M?

13 — M is the 13th letter of the alphabet.

Can I decode numbers back to letters?

Yes — switch the direction to "Numbers to Letters" and paste a sequence like 8 5 12 12 15 to get HELLO.

Related Tools

Length Converter — Convert cm to inches, feet to meters, km to miles and more — instantly.

Weight Converter — Convert kg to lbs, grams to ounces, stones to kg and more.

Temperature Converter — Convert Celsius to Fahrenheit and Kelvin — weather, cooking and science.

Volume Converter — Convert liters to gallons, ml to cups, quarts, pints and cubic feet.

Time Converter — Convert hours to minutes, days to hours, weeks, months and years.

Data Size Converter — Convert MB to GB, GB to TB, bits and bytes — KB vs KiB explained.

Number System Converter — Convert binary, octal, decimal, hex and ASCII text — all at once.

Number to Words Converter — Write numbers in words for cheques and documents — and words back to numbers.

Percent to Decimal Converter — Convert percent to decimal and fraction — all three forms at once.