What does A=1, B=2, C=3 mean?

This is the simplest form of letter-to-number encoding, known as A1Z26. Each letter of the alphabet is assigned a number starting from 1 for A, through 26 for Z.

What is the A1Z26 cipher?

A1Z26 is a basic substitution cipher where each letter corresponds directly to its alphabetical position. It is popular in escape rooms, geocaching, and kids' puzzles.

What is the difference between A1Z26 and ASCII?

A1Z26 maps A to 1 and works only on the 26 English alphabet letters. ASCII is a computing standard that maps uppercase 'A' to 65, lowercase 'a' to 97, and covers digits, punctuation, and control characters.

Is my data safe using this converter?

Yes. All conversions are performed entirely in your browser using client-side JavaScript. No text is uploaded to any server.

The Ultimate letters-to-numbers standard tool

Letters to Numbers Converter

Convert letters to numbers instantly using A1Z26, Reversed Index, ASCII Decimals, Binary bits, Hexadecimal, or Custom character maps. Whether you need to turn letters to numbers for a puzzle, classroom exercise, or coding project, AlphaCoder handles it in milliseconds.100% Client-side — your information never leaves your device.

🧩 Which conversion method or cipher layout do you need?

📝 Input Text / String Message11 chars

🔢 Encoded numeric/cipher output⚡ processed in 0.12ms

Select Encoding System:

Separator Character

Output Case Mode

Pad values (01, 02)

Strict Batch lines

Quick Code Strip:

A=1

B=2

C=3

D=4

E=5

F=6

G=7

H=8

I=9

J=10

K=11

L=12

M=13

N=14

O=15

P=16

Q=17

R=18

S=19

T=20

U=21

V=22

W=23

X=24

Y=25

Z=26

How to Convert Letters to Numbers

Type or Paste

Enter characters, full sentences, or batch numerical code grids into the workspace to convert letters to numbers in real time.

Select Encoding Method

Toggle from A1Z26 alphabet indices to binary sequence bytes with 1-click controls.

Get Results Instantly

Export formatted files directly to .TXT, printable sheets, or copy results safely.

Letters to Numbers Encoding Methods

A1Z26 Alphabet Position

The premier substitution code where each letter equals its literal indexing offset (A=1, B=2 ... Z=26). Ideal for geocachers, escape rooms, school arithmetic, and cipher projects because of its extreme simplicity.

Example: "HELLO" → 8 5 12 12 15

Step-by-Step Examples

A1Z26

"HELLO" to A1Z26

H=8, E=5, L=12, L=12, O=15. Each letter maps to its alphabet position number.

Reversed

"HELLO" Reversed

H=19, E=22, L=15, L=15, O=12. Mirror index where A=26 and Z=1.

Binary

"HELLO" in Binary

H=01001000, E=01000101, L=01001100, O=01001111. Standard 8-bit byte values.

Who Uses Letter-Number Conversion?

Puzzle Enthusiasts & Geocaching

Decode hidden locations inside puzzles or escape room logs. Coordinates can be translated into number strings like "SOUTH" = 19-15-21-20-8.

Classroom Teachers & Kids

Alphabet position lookup makes math and literacy fun. Cipher homework lets kids practice coordinate index mapping and spelling games.

Developers & Tech Students

Perform ASCII lookup, byte translations, hex conversions, and base64 validations inside local development environments securely.

Spreadsheet Users

Convert letters into Excel column numbers (e.g. AZ=52), facilitating column math and indirect workbook reference lookups.

Convert Letters to Numbers in Code

# Python: Letter to A1Z26 number
def text_to_a1z26(text):
    # Map letters to 1-26, skipping non-alphabet
    return [ord(c.lower()) - 96 for c in text if c.isalpha()]

print(text_to_a1z26("hello")) # Returns [8, 5, 12, 12, 15]

# Decode: numbers back to letters
def a1z26_to_text(numbers):
    return "".join([chr(n + 96) for n in numbers])

print(a1z26_to_text([8, 5, 12, 12, 15])) # "hello"

Have questions about converting letters to numbers? Browse the most common queries below covering A1Z26, ASCII, binary, and other encoding methods supported by AlphaCoder.

Frequently Asked Questions

Answer: It is the process of translating alphabetic characters into equivalent numeric values using a specific rule or system, such as their order of appearance in the alphabet (A=1, B=2) or computerized standard numeric codes like ASCII, Binary, or Hexadecimal.

Answer: This is the simplest form of letter-to-number encoding, known as 'Alphabet Position' or A1Z26. Under this system, each letter of the alphabet is assigned a number starting from 1 for A, through 26 for Z.

Answer: You can write words or text and map each letter index manually (A=1... Z=26), or use our real-time online converter. Simply paste your text above, select your desired method, and instant numbers will generate without sending any info to a server.

Answer: By looking up the corresponding alphanumeric characters (e.g., '8 5 12 12 15' becomes 'HELLO'). If you are translating a sequence, toggle our encoder to the 'Numbers ⟷ Letters' (Decode) layout and paste the numbers with spaces, commas, or hyphens.

Answer: A1Z26 is a basic substitution cipher where each letter corresponds directly to its 1-indexed alphabetical position. It is incredibly popular in escape rooms, geocaching caches, and childrens puzzles because it is extremely intuitive to solve.

18 Cipher Tools

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Letters to Numbers — Complete A-Z Chart

Letter	A1Z26	A0Z25	Reversed	ASCII
A	1	0	26	65
B	2	1	25	66
C	3	2	24	67
D	4	3	23	68
E	5	4	22	69
F	6	5	21	70
G	7	6	20	71
H	8	7	19	72
I	9	8	18	73
J	10	9	17	74
K	11	10	16	75
L	12	11	15	76
M	13	12	14	77
N	14	13	13	78
O	15	14	12	79
P	16	15	11	80
Q	17	16	10	81
R	18	17	9	82
S	19	18	8	83
T	20	19	7	84
U	21	20	6	85
V	22	21	5	86
W	23	22	4	87
X	24	23	3	88
Y	25	24	2	89
Z	26	25	1	90