42 in Binary
Decimal 42 equals 101010 in binary.
42 in all number bases
Decimal42
Hexadecimal0x2A
Binary0010 1010
Octal52
Try another value
Edit this value or switch its base. Your changes are calculated in your browser with exact integer arithmetic.
Input base:
Decimal
42Hex
0x2ABinary
0b101010Octal
0o52How 42 converts from decimal to binary
Divide by 2 repeatedly and keep each remainder, then read the remainders from bottom to top:
42÷ 2 =21remainder0
21÷ 2 =10remainder1
10÷ 2 =5remainder0
5÷ 2 =2remainder1
2÷ 2 =1remainder0
1÷ 2 =0remainder1
Result (remainders bottom to top): 101010
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