Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal bases instantly. Free online number system converter.
Binary (Base 2)
-
0-1 digits only
Octal (Base 8)
-
0-7 digits only
Decimal (Base 10)
-
0-9 digits
Hexadecimal (Base 16)
-
0-9, A-F
Number Systems
- Binary (Base 2): Uses only 0 and 1, fundamental to computing
- Octal (Base 8): Uses digits 0-7, often used in file permissions
- Decimal (Base 10): Standard number system we use daily
- Hexadecimal (Base 16): Uses 0-9 and A-F, common in programming and colors
How do I convert binary to decimal?+
Enter the binary number in the binary field and the decimal value appears automatically.
Which bases are supported?+
Binary, octal, decimal and hexadecimal, plus other bases.
Is it free?+
Yes. No signup, no limits, no watermarks.