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Decimal to Binary

Convert a decimal number to binary with the repeated-division working shown, padding to 8, 16, 32 or 64 bits and negative numbers in two's complement.

More options

Need other bases? Use the Number Base Converter.

Numbers 0 to 255

DecimalBinaryHex
00000000000
10000000101
20000001002
30000001103
40000010004
50000010105
60000011006
70000011107
80000100008
90000100109
10000010100A
11000010110B
12000011000C
13000011010D
14000011100E
15000011110F
160001000010
170001000111
180001001012
190001001113
200001010014
210001010115
220001011016
230001011117
240001100018
250001100119
26000110101A
27000110111B
28000111001C
29000111011D
30000111101E
31000111111F
320010000020
330010000121
340010001022
350010001123
360010010024
370010010125
380010011026
390010011127
400010100028
410010100129
42001010102A
43001010112B
44001011002C
45001011012D
46001011102E
47001011112F
480011000030
490011000131
500011001032
510011001133
520011010034
530011010135
540011011036
550011011137
560011100038
570011100139
58001110103A
59001110113B
60001111003C
61001111013D
62001111103E
63001111113F
640100000040
650100000141
660100001042
670100001143
680100010044
690100010145
700100011046
710100011147
720100100048
730100100149
74010010104A
75010010114B
76010011004C
77010011014D
78010011104E
79010011114F
800101000050
810101000151
820101001052
830101001153
840101010054
850101010155
860101011056
870101011157
880101100058
890101100159
90010110105A
91010110115B
92010111005C
93010111015D
94010111105E
95010111115F
960110000060
970110000161
980110001062
990110001163
1000110010064
1010110010165
1020110011066
1030110011167
1040110100068
1050110100169
106011010106A
107011010116B
108011011006C
109011011016D
110011011106E
111011011116F
1120111000070
1130111000171
1140111001072
1150111001173
1160111010074
1170111010175
1180111011076
1190111011177
1200111100078
1210111100179
122011110107A
123011110117B
124011111007C
125011111017D
126011111107E
127011111117F
1281000000080
1291000000181
1301000001082
1311000001183
1321000010084
1331000010185
1341000011086
1351000011187
1361000100088
1371000100189
138100010108A
139100010118B
140100011008C
141100011018D
142100011108E
143100011118F
1441001000090
1451001000191
1461001001092
1471001001193
1481001010094
1491001010195
1501001011096
1511001011197
1521001100098
1531001100199
154100110109A
155100110119B
156100111009C
157100111019D
158100111109E
159100111119F
16010100000A0
16110100001A1
16210100010A2
16310100011A3
16410100100A4
16510100101A5
16610100110A6
16710100111A7
16810101000A8
16910101001A9
17010101010AA
17110101011AB
17210101100AC
17310101101AD
17410101110AE
17510101111AF
17610110000B0
17710110001B1
17810110010B2
17910110011B3
18010110100B4
18110110101B5
18210110110B6
18310110111B7
18410111000B8
18510111001B9
18610111010BA
18710111011BB
18810111100BC
18910111101BD
19010111110BE
19110111111BF
19211000000C0
19311000001C1
19411000010C2
19511000011C3
19611000100C4
19711000101C5
19811000110C6
19911000111C7
20011001000C8
20111001001C9
20211001010CA
20311001011CB
20411001100CC
20511001101CD
20611001110CE
20711001111CF
20811010000D0
20911010001D1
21011010010D2
21111010011D3
21211010100D4
21311010101D5
21411010110D6
21511010111D7
21611011000D8
21711011001D9
21811011010DA
21911011011DB
22011011100DC
22111011101DD
22211011110DE
22311011111DF
22411100000E0
22511100001E1
22611100010E2
22711100011E3
22811100100E4
22911100101E5
23011100110E6
23111100111E7
23211101000E8
23311101001E9
23411101010EA
23511101011EB
23611101100EC
23711101101ED
23811101110EE
23911101111EF
24011110000F0
24111110001F1
24211110010F2
24311110011F3
24411110100F4
24511110101F5
24611110110F6
24711110111F7
24811111000F8
24911111001F9
25011111010FA
25111111011FB
25211111100FC
25311111101FD
25411111110FE
25511111111FF

Shortcuts: Ctrl+Enter run · Ctrl+Shift+C copy result · / search (use ⌘ on Mac)

Next steps

Done here? Use the Send to… menu on the result to carry it on to Binary to Decimal.

Free Decimal to Binary

Type a whole number and get its binary form. The repeated division by 2 is shown, so you can see where each digit comes from. It gives developers a quick browser-based way to solve a focused decimal to binary task before moving the result into a project.

How to use Decimal to Binary

Divide by 2 again and again and read the remainders from the bottom up. Choose padding to fill the number with zeros to a fixed size.

Common mistakes

  • Entering a number with a decimal point: use a whole number.
  • Choosing 8 bits for 300: the largest 8-bit number is 255.

Frequently asked questions

How do you convert decimal to binary?
Divide the number by 2, write the remainder, and repeat with the quotient until it is 0. Read the remainders from last to first.
How are negative numbers written?
In two's complement: write the positive number, flip every bit and add 1. The size (8, 16, 32 or 64 bits) decides how many bits are used.
Why can I not use a decimal point?
This page converts whole numbers. Fractions need a different method.
Is anything uploaded?
No. The conversion runs in your browser.
How do I use this decimal to binary tool?
Use the interactive controls above; processing stays in your browser and the result is intended as a practical starting point for development work.

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