Letters To Numbers Converter

Convert letters to numbers in various formats. Numbering the letters so A=1, B=2, etc is one of the simplest ways of converting them to numbers. This is called the A1Z26 cipher. However, there are more options such as ASCII codes and tap codes to decode numbers. This translation tool will help you easily convert between letters and numbers.

Need to translate in the other direction? Use the Numbers to Letters Converter instead.

Convert Letters To Numbers

Letters

Numbers

Code Type

Language

Alphabet

Code types for Letter-to-Number Conversion

Standard (A1Z26)

Convert each letter to its numeric equivalent in alphabetical order (A=1, B=2, C=3, etc). This is also known as the A1Z26 encryption. No difference is made between uppercase or lowercase.

Letter conversion chart

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

Zero-based (A0Z25)

Similar to standard conversion, but start from zero (A=0, B=1, C=2, etc). This is also sometimes called the A0Z25 cipher.

Letter conversion chart

A = 0

B = 1

C = 2

D = 3

E = 4

F = 5

G = 6

H = 7

I = 8

J = 9

K = 10

L = 11

M = 12

N = 13

O = 14

P = 15

Q = 16

R = 17

S = 18

T = 19

U = 20

V = 21

W = 22

X = 23

Y = 24

Z = 25

ASCII

Convert text to ASCII codes. ASCII codes represent not only letters, but also symbols, digits and spaces are handled by this translator. In ASCII codes there is a difference between uppercase and lowercase letters as well as accented letters. For a complete list of ASCII codes see here.

Letter conversion chart

A = 65

B = 66

C = 67

D = 68

E = 69

F = 70

G = 71

H = 72

I = 73

J = 74

K = 75

L = 76

M = 77

N = 78

O = 79

P = 80

Q = 81

R = 82

S = 83

T = 84

U = 85

V = 86

W = 87

X = 88

Y = 89

Z = 90

Hex ASCII

Similar to ASCII, but the converted numbers are expressed in hexadecimal format.

Letter conversion chart

A = 41

B = 42

C = 43

D = 44

E = 45

F = 46

G = 47

H = 48

I = 49

J = 4A

K = 4B

L = 4C

M = 4D

N = 4E

O = 4F

P = 50

Q = 51

R = 52

S = 53

T = 54

U = 55

V = 56

W = 57

X = 58

Y = 59

Z = 5A

Binary ASCII

Similar to ASCII, but the converted numbers are expressed in binary format.

Letter conversion chart

A = 01000001

B = 01000010

C = 01000011

D = 01000100

E = 01000101

F = 01000110

G = 01000111

H = 01001000

I = 01001001

J = 01001010

K = 01001011

L = 01001100

M = 01001101

N = 01001110

O = 01001111

P = 01010000

Q = 01010001

R = 01010010

S = 01010011

T = 01010100

U = 01010101

V = 01010110

W = 01010111

X = 01011000

Y = 01011001

Z = 01011010

Tap code / knock code

The tap code was used by prisoners in Vietnam, and is sometimes called knock code or Smitty code. It uses a 5x5 square to assign two numbers (row and column) to each letter. Letters are sent by knocking as many times as each number, making pauses between the numbers. Since only 25 letters fit into the square, usually the letter K is coded the same way as C.

Tap code conversion chart

Letter numbers are used frequently in geocaching mystery caches (puzzle caches), CTFs and puzzle games.