10101 in Decimal
Binary 10101 equals 21 in decimal.
10101 in all number bases
Decimal21
Hexadecimal0x15
Binary0001 0101
Octal25
How 10101 converts from binary to decimal
Multiply each digit by 2 raised to its position (starting at 0 from the right), then add the results:
1× 24 = 1 × 16 = 16
0× 23 = 0 × 8 = 0
1× 22 = 1 × 4 = 4
0× 21 = 0 × 2 = 0
1× 20 = 1 × 1 = 1
Sum: 21