Hexadecimal Table

The sixteen digits

Hex	Decimal	Binary	Octal
0	0	0000	0
1	1	0001	1
2	2	0010	2
3	3	0011	3
4	4	0100	4
5	5	0101	5
6	6	0110	6
7	7	0111	7
8	8	1000	10
9	9	1001	11
A	10	1010	12
B	11	1011	13
C	12	1100	14
D	13	1101	15
E	14	1110	16
F	15	1111	17

Powers of sixteen

The place values. Each position is worth sixteen times the one to its right.

Power	Hex	Decimal
16⁰	1	1
16¹	10	16
16²	100	256
16³	1000	4,096
16⁴	10000	65,536
16⁵	100000	1,048,576
16⁶	1000000	16,777,216
16⁷	10000000	268,435,456
16⁸	100000000	4,294,967,296

Bit widths and what fits

Bits	Hex digits	Max unsigned	Signed range	Typically
4	1	F (15)	−8 to 7	A nibble, one mask
8	2	FF (255)	−128 to 127	A byte, a character, a color channel
16	4	FFFF (65,535)	−32,768 to 32,767	A word, a port number
32	8	FFFFFFFF	±2.1 billion	An int, an IPv4 address
64	16	FFFFFFFFFFFFFFFF	±9.2 quintillion	A long, a pointer

Full table: 0 to 255 in all four bases

Every value a single byte can hold, in hexadecimal, decimal, binary and octal.

Hex	Decimal	Binary	Octal
00	0	00000000	000
01	1	00000001	001
02	2	00000010	002
03	3	00000011	003
04	4	00000100	004
05	5	00000101	005
06	6	00000110	006
07	7	00000111	007
08	8	00001000	010
09	9	00001001	011
0A	10	00001010	012
0B	11	00001011	013
0C	12	00001100	014
0D	13	00001101	015
0E	14	00001110	016
0F	15	00001111	017
10	16	00010000	020
11	17	00010001	021
12	18	00010010	022
13	19	00010011	023
14	20	00010100	024
15	21	00010101	025
16	22	00010110	026
17	23	00010111	027
18	24	00011000	030
19	25	00011001	031
1A	26	00011010	032
1B	27	00011011	033
1C	28	00011100	034
1D	29	00011101	035
1E	30	00011110	036
1F	31	00011111	037
20	32	00100000	040
21	33	00100001	041
22	34	00100010	042
23	35	00100011	043
24	36	00100100	044
25	37	00100101	045
26	38	00100110	046
27	39	00100111	047
28	40	00101000	050
29	41	00101001	051
2A	42	00101010	052
2B	43	00101011	053
2C	44	00101100	054
2D	45	00101101	055
2E	46	00101110	056
2F	47	00101111	057
30	48	00110000	060
31	49	00110001	061
32	50	00110010	062
33	51	00110011	063
34	52	00110100	064
35	53	00110101	065
36	54	00110110	066
37	55	00110111	067
38	56	00111000	070
39	57	00111001	071
3A	58	00111010	072
3B	59	00111011	073
3C	60	00111100	074
3D	61	00111101	075
3E	62	00111110	076
3F	63	00111111	077
40	64	01000000	100
41	65	01000001	101
42	66	01000010	102
43	67	01000011	103
44	68	01000100	104
45	69	01000101	105
46	70	01000110	106
47	71	01000111	107
48	72	01001000	110
49	73	01001001	111
4A	74	01001010	112
4B	75	01001011	113
4C	76	01001100	114
4D	77	01001101	115
4E	78	01001110	116
4F	79	01001111	117
50	80	01010000	120
51	81	01010001	121
52	82	01010010	122
53	83	01010011	123
54	84	01010100	124
55	85	01010101	125
56	86	01010110	126
57	87	01010111	127
58	88	01011000	130
59	89	01011001	131
5A	90	01011010	132
5B	91	01011011	133
5C	92	01011100	134
5D	93	01011101	135
5E	94	01011110	136
5F	95	01011111	137
60	96	01100000	140
61	97	01100001	141
62	98	01100010	142
63	99	01100011	143
64	100	01100100	144
65	101	01100101	145
66	102	01100110	146
67	103	01100111	147
68	104	01101000	150
69	105	01101001	151
6A	106	01101010	152
6B	107	01101011	153
6C	108	01101100	154
6D	109	01101101	155
6E	110	01101110	156
6F	111	01101111	157
70	112	01110000	160
71	113	01110001	161
72	114	01110010	162
73	115	01110011	163
74	116	01110100	164
75	117	01110101	165
76	118	01110110	166
77	119	01110111	167
78	120	01111000	170
79	121	01111001	171
7A	122	01111010	172
7B	123	01111011	173
7C	124	01111100	174
7D	125	01111101	175
7E	126	01111110	176
7F	127	01111111	177
80	128	10000000	200
81	129	10000001	201
82	130	10000010	202
83	131	10000011	203
84	132	10000100	204
85	133	10000101	205
86	134	10000110	206
87	135	10000111	207
88	136	10001000	210
89	137	10001001	211
8A	138	10001010	212
8B	139	10001011	213
8C	140	10001100	214
8D	141	10001101	215
8E	142	10001110	216
8F	143	10001111	217
90	144	10010000	220
91	145	10010001	221
92	146	10010010	222
93	147	10010011	223
94	148	10010100	224
95	149	10010101	225
96	150	10010110	226
97	151	10010111	227
98	152	10011000	230
99	153	10011001	231
9A	154	10011010	232
9B	155	10011011	233
9C	156	10011100	234
9D	157	10011101	235
9E	158	10011110	236
9F	159	10011111	237
A0	160	10100000	240
A1	161	10100001	241
A2	162	10100010	242
A3	163	10100011	243
A4	164	10100100	244
A5	165	10100101	245
A6	166	10100110	246
A7	167	10100111	247
A8	168	10101000	250
A9	169	10101001	251
AA	170	10101010	252
AB	171	10101011	253
AC	172	10101100	254
AD	173	10101101	255
AE	174	10101110	256
AF	175	10101111	257
B0	176	10110000	260
B1	177	10110001	261
B2	178	10110010	262
B3	179	10110011	263
B4	180	10110100	264
B5	181	10110101	265
B6	182	10110110	266
B7	183	10110111	267
B8	184	10111000	270
B9	185	10111001	271
BA	186	10111010	272
BB	187	10111011	273
BC	188	10111100	274
BD	189	10111101	275
BE	190	10111110	276
BF	191	10111111	277
C0	192	11000000	300
C1	193	11000001	301
C2	194	11000010	302
C3	195	11000011	303
C4	196	11000100	304
C5	197	11000101	305
C6	198	11000110	306
C7	199	11000111	307
C8	200	11001000	310
C9	201	11001001	311
CA	202	11001010	312
CB	203	11001011	313
CC	204	11001100	314
CD	205	11001101	315
CE	206	11001110	316
CF	207	11001111	317
D0	208	11010000	320
D1	209	11010001	321
D2	210	11010010	322
D3	211	11010011	323
D4	212	11010100	324
D5	213	11010101	325
D6	214	11010110	326
D7	215	11010111	327
D8	216	11011000	330
D9	217	11011001	331
DA	218	11011010	332
DB	219	11011011	333
DC	220	11011100	334
DD	221	11011101	335
DE	222	11011110	336
DF	223	11011111	337
E0	224	11100000	340
E1	225	11100001	341
E2	226	11100010	342
E3	227	11100011	343
E4	228	11100100	344
E5	229	11100101	345
E6	230	11100110	346
E7	231	11100111	347
E8	232	11101000	350
E9	233	11101001	351
EA	234	11101010	352
EB	235	11101011	353
EC	236	11101100	354
ED	237	11101101	355
EE	238	11101110	356
EF	239	11101111	357
F0	240	11110000	360
F1	241	11110001	361
F2	242	11110010	362
F3	243	11110011	363
F4	244	11110100	364
F5	245	11110101	365
F6	246	11110110	366
F7	247	11110111	367
F8	248	11111000	370
F9	249	11111001	371
FA	250	11111010	372
FB	251	11111011	373
FC	252	11111100	374
FD	253	11111101	375
FE	254	11111110	376
FF	255	11111111	377

Landmark values

Hex	Decimal	Significance
0F	15	Low nibble mask
10	16	The base itself
20	32	ASCII space; the case-flip offset
30	48	ASCII digit zero
41	65	ASCII capital A
61	97	ASCII lower case a
7F	127	Largest signed byte; last ASCII code
80	128	Sign bit alone
FF	255	A full byte
100	256	One byte overflowed
3E8	1,000	One thousand
FFFF	65,535	A full 16-bit word
DEADBEEF	3,735,928,559	A classic debug marker — spellable in hex

That last row is a small joke that stuck. Because hex uses A to F, a handful of English words can be written as valid hex values, and programmers have used them as recognisable markers in memory for decades. Spotting DEADBEEF in a dump usually means uninitialised memory.

Using the table

For values above 255, apply the same rules pair by pair — every two hex digits is one byte, and the table covers every byte there is. For anything long, the hex converter handles arbitrary lengths exactly.

Frequently asked questions

What is the hexadecimal number system?

A positional system with base 16, using digits 0 to 9 then A to F for ten to fifteen. Each position is worth sixteen times the one to its right.

How many values does one byte hold?

256, from 00 to FF. That is 2 to the power of 8, counting zero.

What is FF in decimal, binary and octal?

255, 11111111 and 377 respectively.

Why does the table stop at 255?

255 is one full byte. Larger values are combinations of bytes, and the same rules apply to each pair of hex digits.

What does DEADBEEF mean?

It is a valid hex number, 3,735,928,559, used as a recognisable marker for uninitialised memory. Hex letters A to F make a few English words spellable.

How many hex digits fit in 32 bits?

Eight. Each digit is four bits, so 32 divided by 4 gives 8.

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