Binary Alphabet: Complete A-Z Binary Code Chart

A binary alphabet is the English alphabet written as binary code. Each letter is one byte: 8 bits, a decimal value, and a character. Uppercase A is decimal 65 and 01000001. Lowercase a is decimal 97 and 01100001. They are not the same byte.

The charts below list A-Z, a-z, the digits 0-9, and common symbols. To decode a full word instead of one letter, use the binary to text page, or the binary translator to english.

Uppercase A-Z

Uppercase letters run from decimal 65 to 90. The binary values count up by one, so B is the next byte after A.

Character	Decimal	Binary
A	65	01000001
B	66	01000010
C	67	01000011
D	68	01000100
E	69	01000101
F	70	01000110
G	71	01000111
H	72	01001000
I	73	01001001
J	74	01001010
K	75	01001011
L	76	01001100
M	77	01001101
N	78	01001110
O	79	01001111
P	80	01010000
Q	81	01010001
R	82	01010010
S	83	01010011
T	84	01010100
U	85	01010101
V	86	01010110
W	87	01010111
X	88	01011000
Y	89	01011001
Z	90	01011010

Lowercase a-z

Lowercase letters run from decimal 97 to 122. The lowercase byte is the uppercase byte with one extra bit set, which is why a is 01100001 and A is 01000001.

Character	Decimal	Binary
a	97	01100001
b	98	01100010
c	99	01100011
d	100	01100100
e	101	01100101
f	102	01100110
g	103	01100111
h	104	01101000
i	105	01101001
j	106	01101010
k	107	01101011
l	108	01101100
m	109	01101101
n	110	01101110
o	111	01101111
p	112	01110000
q	113	01110001
r	114	01110010
s	115	01110011
t	116	01110100
u	117	01110101
v	118	01110110
w	119	01110111
x	120	01111000
y	121	01111001
z	122	01111010

Digits 0-9

The characters "0" through "9" are not the numbers 0 through 9. The character 0 is decimal 48, binary 00110000.

Character	Decimal	Binary
0	48	00110000
1	49	00110001
2	50	00110010
3	51	00110011
4	52	00110100
5	53	00110101
6	54	00110110
7	55	00110111
8	56	00111000
9	57	00111001

Common Symbols

Space, punctuation, and @ show up as often as letters. Space is decimal 32, 00100000. @ is decimal 64, 01000000.

Character	Decimal	Binary
Space	32	00100000
.	46	00101110
,	44	00101100
?	63	00111111
!	33	00100001
@	64	01000000
#	35	00100011
'	39	00100111
"	34	00100010
-	45	00101101
:	58	00111010
/	47	00101111

How to Read One Letter

Take 01000001. The place values from the left are 128, 64, 32, 16, 8, 4, 2, 1. Only 64 and 1 are switched on, so 64 + 1 = 65. Decimal 65 is A in the chart above. Repeat that for every group of 8 bits.

Check a longer string on the binary translator to english. 01001000 01101001 is H then i.

Related Articles

• What Is Binary Code? — Bits, bytes, and why computers store letters this way.
• How to Read Binary Code — The same lookup, worked by hand on a full word.