Binary / Decimal / Hex Reference

Side-by-side table of 0–255 in binary, decimal, hexadecimal, and octal.

Reference Reference Updated Apr 19, 2026
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Reference

0 – 31

Decimal Binary Hex Octal
0 00000000 00 000
1 00000001 01 001
2 00000010 02 002
3 00000011 03 003
4 00000100 04 004
5 00000101 05 005
6 00000110 06 006
7 00000111 07 007
8 00001000 08 010
9 00001001 09 011
10 00001010 0A 012
11 00001011 0B 013
12 00001100 0C 014
13 00001101 0D 015
14 00001110 0E 016
15 00001111 0F 017
16 00010000 10 020
17 00010001 11 021
18 00010010 12 022
19 00010011 13 023
20 00010100 14 024
21 00010101 15 025
22 00010110 16 026
23 00010111 17 027
24 00011000 18 030
25 00011001 19 031
26 00011010 1A 032
27 00011011 1B 033
28 00011100 1C 034
29 00011101 1D 035
30 00011110 1E 036
31 00011111 1F 037

32 – 63

Decimal Binary Hex Octal
32 00100000 20 040
33 00100001 21 041
34 00100010 22 042
35 00100011 23 043
36 00100100 24 044
37 00100101 25 045
38 00100110 26 046
39 00100111 27 047
40 00101000 28 050
41 00101001 29 051
42 00101010 2A 052
43 00101011 2B 053
44 00101100 2C 054
45 00101101 2D 055
46 00101110 2E 056
47 00101111 2F 057
48 00110000 30 060
49 00110001 31 061
50 00110010 32 062
51 00110011 33 063
52 00110100 34 064
53 00110101 35 065
54 00110110 36 066
55 00110111 37 067
56 00111000 38 070
57 00111001 39 071
58 00111010 3A 072
59 00111011 3B 073
60 00111100 3C 074
61 00111101 3D 075
62 00111110 3E 076
63 00111111 3F 077

Common boundaries

Decimal Binary Hex Octal
64 1000000 40 100
128 10000000 80 200
192 11000000 C0 300
224 11100000 E0 340
240 11110000 F0 360
248 11111000 F8 370
252 11111100 FC 374
254 11111110 FE 376
255 11111111 FF 377
100 1100100 64 144
200 11001000 C8 310
1024 10000000000 400 2000
65535 1111111111111111 FFFF 177777
1048576 100000000000000000000 100000 4000000

Powers of 2

Exponent Decimal Note
2⁸ 256 1 byte
2¹⁰ 1,024 1 KiB (≈ 1K)
2¹⁶ 65,536 2 bytes / uint16 range
2²⁰ 1,048,576 1 MiB
2³² 4,294,967,296 uint32 range
2⁶⁴ 1.844 × 10¹⁹ uint64 range

Notes

  • Hex prefixes: 0x (C / most), # (colors), $ (assembly).
  • Octal prefix: 0 (C legacy) or 0o (modern).
  • Binary prefix: 0b (most languages).

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