Numbers To Letters Converter

Convert numbers to letters 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, tap codes or even the periodic table of elements to decode numbers. This translation tool will help you easily convert between numbers and letters.

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

Convert Numbers To Letters

Numbers

Letters

Code Type

Language

Alphabet

Code types for Number-to-Letter Conversion

Standard (A1Z26)

Each letter is represented by its position in the alphabet: A = 1, B = 2, ..., Z = 26. This method is known as the A1Z26 cipher. Uppercase and lowercase letters are treated the same.

Letter conversion chart

1 = A

2 = B

3 = C

4 = D

5 = E

6 = F

7 = G

8 = H

9 = I

10 = J

11 = K

12 = L

13 = M

14 = N

15 = O

16 = P

17 = Q

18 = R

19 = S

20 = T

21 = U

22 = V

23 = W

24 = X

25 = Y

26 = Z

Zero-based (A0Z25)

A variation of the standard cipher where counting begins at zero: A = 0, B = 1, ..., Z = 25. This is often referred to as the A0Z25 cipher. Like A1Z26, it does not distinguish between uppercase and lowercase.

Letter conversion chart

0 = 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

ASCII

Converts each character to its corresponding ASCII (American Standard Code for Information Interchange) value. This includes not only letters, but also digits, punctuation, and whitespace. ASCII codes are case-sensitive and can represent extended characters such as accented letters. For a complete list of ASCII codes see here.

Letter conversion chart

65 = A

66 = B

67 = C

68 = D

69 = E

70 = F

71 = G

72 = H

73 = I

74 = J

75 = K

76 = L

77 = M

78 = N

79 = O

80 = P

81 = Q

82 = R

83 = S

84 = T

85 = U

86 = V

87 = W

88 = X

89 = Y

90 = Z

Hex ASCII

Similar to standard ASCII, but each character is represented by its ASCII value in hexadecimal format (base 16). For example, 'A' becomes 41 and 'a' becomes 61.

Letter conversion chart

41 = A

42 = B

43 = C

44 = D

45 = E

46 = F

47 = G

48 = H

49 = I

4A = J

4B = K

4C = L

4D = M

4E = N

4F = O

50 = P

51 = Q

52 = R

53 = S

54 = T

55 = U

56 = V

57 = W

58 = X

59 = Y

5A = Z

Binary ASCII

Each character is translated to its ASCII value in binary format (base 2). For instance, 'A' becomes 01000001. Useful for visualizing or encoding text at the bit level.

Letter conversion chart

01000001 = A

01000010 = B

01000011 = C

01000100 = D

01000101 = E

01000110 = F

01000111 = G

01001000 = H

01001001 = I

01001010 = J

01001011 = K

01001100 = L

01001101 = M

01001110 = N

01001111 = O

01010000 = P

01010001 = Q

01010010 = R

01010011 = S

01010100 = T

01010101 = U

01010110 = V

01010111 = W

01011000 = X

01011001 = Y

01011010 = Z

Tap code (knock code)

A simple cipher that assigns coordinates in a 5×5 grid to each letter. It conveys letters through two numbers (row and column), often tapped out using sounds. Because the grid only allows 25 entries, C and K are usually treated as the same letter. This code was famously used by prisoners of war for covert communication.

Tap code conversion chart

Periodic Table

Each number corresponds to a chemical element’s atomic number: 1 = H (Hydrogen), 2 = He (Helium), and so on. This encoding method uses element symbols in place of standard letters.

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