How to use this converter
- Type or paste your text in the box above.
- Pick A=1 (standard) or A=0 (programmer style).
- Choose how numbers are separated — space, comma, hyphen, or none.
- Copy the result with the Copy button. That is all.
What is the letters to numbers code?
Every letter of the alphabet gets a number: A is 1, B is 2, C is 3, and so on up to Z, which is 26. This code is also called A1Z26, because A=1 and Z=26. It is one of the simplest ways to turn words into numbers, and it shows up in puzzle hunts, escape rooms, geocaching clues, classroom maths games, and beginner cryptography lessons.
For example, the word HELLO becomes 8 5 12 12 15 — H is the 8th letter, E is the 5th, L is the 12th, and O is the 15th. The word CIPHER becomes 3 9 16 8 5 18. Because the code is fixed, anyone who knows the rule can read it, which is exactly why it is a puzzle code and not real security.
Other names for this tool: letter to number converter, letters to numbers converter, alphabet to numbers converter, and convert letters to numbers — they all mean the same thing, and this page does all of it.
Letter to number table (A=1)
| A | B | C | D | E | F | G | H | I | J | K | L | M |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |
Examples
- HELLO → 8 5 12 12 15
- HELLO WORLD → 8 5 12 12 15 / 23 15 18 12 4
- CIPHER → 3 9 16 8 5 18
- SECRET MESSAGE → 19 5 3 18 5 20 / 13 5 19 19 1 7 5
Where is this code used?
- Puzzle hunts and escape rooms — a string of numbers like 8-5-12-12-15 is a classic first clue.
- Geocaching — coordinates and hints are often hidden behind A1Z26.
- Classroom games — teachers use it to make word maths fun (add the letters of your name).
- CTF and beginner code-breaking — number strings are often the first thing to test when a cipher is unknown.
- Word-number games — some numerology systems add letter values together, though those meanings are belief, not maths.
Frequently asked questions
What is the letters to numbers converter?
It turns each letter into its position in the alphabet: A=1, B=2, C=3, up to Z=26. For example, HELLO becomes 8 5 12 12 15.
What is the letter to number converter?
The same tool under a shorter name: it converts letters to numbers, one letter at a time, using A=1 to Z=26.
Should A be 1 or 0?
Most puzzles and the A1Z26 code use A=1. Programmers sometimes use A=0. This tool lets you pick either.
How are spaces handled?
Spaces mark word breaks. By default words are separated with a slash, like 8 5 12 12 15 / 23 15 18 12 4. You can change this in the options.
Can I convert numbers back to letters?
Yes — use the Numbers to Letters Converter on this site, which does the reverse.
Is this real encryption?
No. Letter-to-number conversion is an encoding, not encryption. Anyone can reverse it. Never use it to protect private information.
Related tools
Numbers to Letters Converter — the reverse of this tool. A1Z26 Cipher (coming soon) — the same code with its history and variants. Caesar Cipher Decoder — for letter-shift ciphers instead of number codes.