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To convert to decimal, multiply each digit by the base raised to the power of its place and add the results: 1011₂ = 1×2³ + 0×2² + 1×2¹ + 1×2⁰ = 11.
To convert decimal to another base, divide by the base repeatedly and note each remainder until the quotient is 0. The remainders read from bottom to top give the answer.
Digits above 9 are written as letters: A = 10, B = 11 and so on to F = 15 in hexadecimal, and up to Z = 35 in base 36. Capital or small letters may be used.
Binary and hexadecimal results are grouped in fours, and octal and decimal results in threes, for easier checking. Copied results have no spaces.
Whole numbers are converted exactly, however many digits they have. Fractions are not converted.
All calculations are done in your browser. The details you enter are not sent to any server.

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