Letters to Numbers Converter
A1Z26 alphabet to number chart, ASCII, hex, and binary — encode or decode instantly.
Each letter is its place in the alphabet.
A=1 to Z=26 chart
Tap a letter to add it
How it works
How to convert letters to numbers with A1Z26
A1Z26 is the standard alphabet to number system: A=1, B=2, C=3, through Z=26. Replace each letter with its position, keep a delimiter between values, and ignore punctuation unless you switch to ASCII. HELLO becomes 8-5-12-12-15. Use Numbers → Letters with the same mapping to decode.
A1Z26 letter to number chart
Full A=1 to Z=26 chart. This is the mapping most people want when they search for a letters to numbers converter or alphabet to number tool.
| Letter | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |
Worked letters to numbers examples
Same words in A1Z26 and ASCII so you can see why the two systems are not interchangeable.
| Input | A1Z26 | ASCII decimal | Notes |
|---|---|---|---|
| HELLO | 8-5-12-12-15 | 72 69 76 76 79 | Most searched letters-to-numbers example |
| HELLO WORLD | 8-5-12-12-15 / 23-15-18-12-4 | 72 69 76 76 79 32 87 79 82 76 68 | Spaces kept as word breaks |
| CAT | 3-1-20 | 67 65 84 | Short alphabet to number check |
| A | 1 | 65 | A=1 in A1Z26, A=65 in ASCII |
| Z | 26 | 90 | Last letter of the alphabet chart |
A1Z26 vs ASCII, hex, and binary
Use A1Z26 when the question is “what number is this letter in the alphabet?” Use ASCII when the question is “what code does the computer use for this character?” Hex and binary are the same ASCII values in base-16 and base-2.
- A1Z26: A=1 … Z=26. Best for puzzles, teaching, and alphabet to number searches.
- A0Z25: A=0 … Z=25. Common in zero-based programming indexes.
- Reverse: Z=1 … A=26. Alternate puzzle key.
- ASCII / hex / binary: A=65 / 41 / 01000001. Case-sensitive; space is 32.
ASCII sample chart
| Character | Decimal | Hex | Binary |
|---|---|---|---|
| A | 65 | 41 | 01000001 |
| a | 97 | 61 | 01100001 |
| 0 | 48 | 30 | 00110000 |
| space | 32 | 20 | 00100000 |
| ! | 33 | 21 | 00100001 |
Convert numbers back to letters
Switch the tool to Numbers → Letters and keep the same encoding.8-5-12-12-15decodes to HELLO in A1Z26.72 69 76 76 79decodes to HELLO in ASCII.8-5-12-12-15 / 23-15-18-12-4decodes to HELLO WORLD. Hyphens, slashes, commas, and spaces all work as separators. If a value is out of range for A1Z26 (not 1–26), it is skipped so bad puzzle input does not invent letters.
Where letters to numbers conversion is used
Puzzles, teaching, numerology, and ASCII checks — same converter, different encodings.
6 practical scenarios
Puzzles and escape rooms
Decode A1Z26 clues such as 3-1-20 → CAT, or encode a keyword before hiding it in a puzzle.
Teaching the alphabet
Show A=1 through Z=26 with a live chart so students can check letter order and spelling.
Name numerology
Sum letter values and reduce to a single digit for name analysis without doing the arithmetic by hand.
ASCII and encoding checks
Confirm decimal, hex, or binary character codes while debugging scripts and data transforms.
Simple ciphers
Build or break beginner substitution ciphers with A1Z26, A0Z25, or reverse Z=1 mapping.
Spreadsheets and indexes
Turn labels into numeric indexes for lookup tables, game grids, or batch data cleanup.
A1Z26, ASCII, hex, and binary in one converter
Alphabet to number mapping plus character codes, with encode, decode, sums, and a live letter chart.
A1Z26 alphabet to number
The standard letter to number chart: A=1, B=2, … Z=26. Decode 8-5-12-12-15 back to HELLO.
Encode and decode
Convert letters to numbers or numbers back to letters in one tool. Swap direction without losing your work.
ASCII, hex, and binary
Same converter for character codes: A=65, hex 41, binary 01000001. Case-sensitive when you need it.
Sum and numerology reduction
Add letter values and reduce to a single digit (HELLO → 52 → 7) for puzzles and name numerology.
A0Z25 and reverse ciphers
Zero-based A=0…Z=25 and reverse Z=1…A=26 for programming exercises and alternate puzzle keys.
Copy, upload, download
Paste from the clipboard, upload a .txt file, or download the converted output. Batch-process multiple lines.
How to Use
Simple 4-step process
Step 1
Choose Letters → Numbers or Numbers → Letters, then pick A1Z26, A0Z25, reverse, ASCII, hex, or binary.
Step 2
Type or paste your text (HELLO) or number sequence (8-5-12-12-15). Conversion updates instantly.
Step 3
Set the delimiter and optional sum / single-digit reduction for alphabet and numerology work.
Step 4
Copy or download the result. Nothing is uploaded — conversion runs in your browser.
Frequently Asked Questions
Everything you need to know about this tool and how it works.
See Full FAQType any word or sentence into the converter and choose A1Z26. Each letter maps to its position in the alphabet: A=1, B=2, C=3, through Z=26. HELLO becomes 8-5-12-12-15. Switch to ASCII if you need computer character codes instead (H=72, E=69).
A1Z26 is the simple alphabet to number cipher: A=1, B=2, … Z=26. It shows up in puzzles, escape rooms, geocaching clues, and beginner cryptography. Uppercase and lowercase count as the same letter unless you are using ASCII mode.
Alphabet to number conversion replaces each letter with its index in the English alphabet. The most common system is A1Z26. A0Z25 starts at zero (A=0, Z=25). Reverse mapping uses Z=1 and A=26. This tool supports all three, plus ASCII decimal, hex, and binary.
Choose Numbers → Letters, pick the same encoding used to create the sequence, and paste values such as 8-5-12-12-15 or 8-5-12-12-15 / 23-15-18-12-4. Hyphens, slashes, commas, and spaces are detected automatically for A1Z26.
In A1Z26, spaces are kept as word breaks. HELLO WORLD becomes 8-5-12-12-15 / 23-15-18-12-4. Swap back to decode that string into HELLO WORLD. Turn on Count spaces as 0 only if you want spaces included in a numerology sum.
No. A1Z26 is alphabet position (A=1). ASCII is a character encoding standard (A=65, a=97, space=32). Use A1Z26 for puzzles and alphabet charts. Use ASCII, hex, or binary when you need actual character codes for programming.
In A1Z26, A0Z25, and reverse modes, H and h both map to the same value. In ASCII, hex, and binary, case matters: A=65 / 41 / 01000001 and a=97 / 61 / 01100001.
Yes. The sidebar shows the chart for the encoding you selected, and the full A=1 through Z=26 table is on this page below the converter. HELLO = 8-5-12-12-15 and CAT = 3-1-20.
Numerology and some puzzles add letter values, then keep adding digits until one remains. HELLO is 8+5+12+12+15 = 52, then 5+2 = 7. Enable Calculate sum and Single-digit reduction for that output.
Yes. It runs entirely in your browser, with no signup and no upload of your text to a server. Copy, download, and convert as much as you need.
Yes. Keep Batch processing on and each line converts independently — useful for name lists, puzzle sheets, or CSV-style input.
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