# Convert from one number system to another

Decimal

The number system is a way of representing a number. The same number can be represented in different ways. For example, the number 200 in the usual decimal system can have the form 11001000 in binary, 310 in octal and C8 in hexadecimal.
There are other number systems, but we did not include them in the Converter because of the low popularity.
To specify the number system when writing a number, a subscript is used, which is placed after the number:
20010 = 110010002 = 3108 = C816