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Binary, Decimal, Hex Converter

Type a number in any base and see it in decimal, binary, octal and hexadecimal at once.

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Decimal (base 10)

Binary (base 2)

Octal (base 8)

Hexadecimal (base 16)

Decimal to binary (division method)

Divide by 2 repeatedly and read the remainders from bottom to top. 13 → 13÷2 = 6 r1, 6÷2 = 3 r0, 3÷2 = 1 r1, 1÷2 = 0 r1 → 1101.

Multiply each bit by its place value (1, 2, 4, 8, …) from the right and add: 1101 = 8 + 4 + 0 + 1 = 13.

Hex uses 0–9 and A–F (10–15). Each hex digit is exactly 4 bits, which is why colours (#FF5733) and memory addresses use it. FF = 255; 1A = 26.

Decimal	Binary	Octal	Hex
8	1000	10	8
10	1010	12	A
16	10000	20	10
100	1100100	144	64
255	11111111	377	FF
1024	10000000000	2000	400

Want to encode words? Use text to binary.

What is 255 in binary?

11111111 (eight 1s) — FF in hex.

How do I convert hex to decimal?

Multiply each digit by 16 to the power of its position: 1A = 1×16 + 10 = 26.

What is 1010 in decimal?

10.