Converter

Number Base Converter

Convert numbers between decimal, binary, octal, and hexadecimal

Decimal (base 10)

Binary (base 2)

Octal (base 8)

Hexadecimal (base 16)

Custom Base Converter (Base 2-36)

From Base

To Base

Input (Base 10)Valid digits: 0123456789

Quick Reference (0 - 15)

Decimal	Binary	Octal	Hex	ASCII
0	0000	0	0	NUL
1	0001	1	1	CTRL-A
2	0010	2	2	CTRL-B
3	0011	3	3	CTRL-C
4	0100	4	4	CTRL-D
5	0101	5	5	CTRL-E
6	0110	6	6	CTRL-F
7	0111	7	7	BEL
8	1000	10	8	BS
9	1001	11	9	TAB
10	1010	12	A	LF
11	1011	13	B	CTRL-K
12	1100	14	C	CTRL-L
13	1101	15	D	CR
14	1110	16	E	CTRL-N
15	1111	17	F	CTRL-O

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What is Number Base Converter?

Free online number base converter to convert numbers between different base systems instantly: decimal (base 10), binary (base 2), octal (base 8), and hexadecimal (base 16).

Enter a number in any base and see it converted to all other bases in real time. Convert decimal to binary, binary to decimal, decimal to hex, hex to binary, and octal in any direction without manual long division. Type into any field and the other three update together, which is handy for checking color values, memory addresses, bitmasks, and homework. Essential for programmers working with low-level code, networking, and digital systems. Supports both integer and large number conversions. No signup required.

How to Use Number Base Converter

1Enter a number in any of the input fields (decimal, binary, octal, or hex)
2See instant conversions to all other bases
3Use the copy button next to any output to copy the converted value
4Clear all fields to start a new conversion

Frequently Asked Questions

A number base (or radix) defines how many digits are available. Decimal (base 10) uses 0-9. Binary (base 2) uses 0 and 1. Octal (base 8) uses 0-7. Hexadecimal (base 16) uses 0-9 and A-F. Different bases are used in computing, networking, and mathematics.

Computers operate using binary (base 2) because digital circuits have two states: on and off. All data - numbers, text, images - is ultimately stored and processed as binary. Understanding binary helps with debugging, bitwise operations, and low-level programming.

Hexadecimal is commonly used for memory addresses, color codes (like #FF5733), MAC addresses, and representing binary data compactly. Each hex digit represents exactly 4 binary digits, making conversions between hex and binary straightforward.

Type your number into the decimal field. The binary, octal, and hexadecimal fields update at the same time, so you see all four representations at once without running the division yourself. The same works in reverse if you start from any other field.

Yes. Enter the value in the hex field and read the binary field for the result. Because each hex digit maps to exactly four binary digits, the conversion is exact, and octal and decimal are filled in alongside it.

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Custom Base Converter (Base 2-36)

From Base

To Base

Input (Base 10)Valid digits: 0123456789

Decimal

Binary

Octal

Hex

ASCII

0000

NUL

0001

CTRL-A

0010

CTRL-B

0011

CTRL-C

0100

CTRL-D

0101

CTRL-E

0110

CTRL-F

0111

BEL

1000

1001

TAB

1010

1011

CTRL-K

1100

CTRL-L

1101

1110

CTRL-N

1111

CTRL-O

What is Number Base Converter?

Free online number base converter to convert numbers between different base systems instantly: decimal (base 10), binary (base 2), octal (base 8), and hexadecimal (base 16).

Frequently Asked Questions