Number System Conversion

Convert values ​​in one number system to values ​​in other systems: binary, octal, decimal, hexadecimal, and any other number system. Enter a starting value and click Calculate to convert it to the other number system. In addition to the four predefined systems, you can select another system with any base up to 36.
Please enter only whole numbers into the calculator. The calculation is correct in the decimal range for numbers up to 16 digits.


Binary (2):    
Octal (8):    
Decimal (10):    
Hexadecimal (16):    




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The most common number system we use for most calculations is the decimal system. It uses digits from 0 to 9, larger whole numbers are represented with more than one digit. This system has been used for thousands of years, but it wasn't the only number system throughout history. Its eventual dominance likely has a lot to do with the number of fingers we typically have.
The binary system is particularly well-known in computer science, computers use it internally. This system only uses 0 and 1. In logic, these two values ​​are also referred to as no and yes.
The octal system is used in a few technical applications and in computer science. It uses the digits from 0 to 7.
The hexadecimal system, or base 16 system, uses the digits from 0 to 9 and then the letters A to F. It is primarily used to represent colors on screens. A color has a red component, a green component and a blue component. Each of these can range from 0 to 255, thus having 256 levels, which is 16², or FF in hexadecimal. Fot this, see the color calculator.
Other number systems are less common, but can still occur. These systems go up to base 36, as this base allows for all digits from 0 to 9 and all letters from A to Z. Systems with larger bases must use additional symbols, which don't necessarily follow a pre-existing sequence. In these systems, uppercase and lowercase letters can be assigned different meanings, or symbols can be used. In the hexadecimal system, however, uppercase and lowercase letters are usually treated the same.


Last updated on 03/10/2026.

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