Base Converter

Convert numbers between binary, octal, decimal, and hex.

Decimal (Base 10)

Binary (Base 2)

Octal (Base 8)

Hexadecimal (Base 16)

What Is a Base Converter?

The Base Converter is an essential tool for computer scientists, programmers, and mathematicians. It allows you to instantly translate numbers between the four most common numeral systems used in computing: Decimal (Base 10), Binary (Base 2), Octal (Base 8), and Hexadecimal (Base 16). This free online tool is useful for base converter, binary decimal hexadecimal octal converter, number base converter. Common use cases include programming, computer science, hexadecimal values, binary numbers, and numeral-system conversions. It is designed for quick browser-based calculations and is suitable for homework, programming, study, everyday math, and checking results.

How to Use This Base Converter

1
Choose the Input BaseSelect Decimal, Binary, Octal, or Hexadecimal.
2
Enter a NumberType a valid number for the selected base.
3
Review the ConversionsThe tool converts the value into the other supported bases.
4
Edit Any FieldYou can change another base value and update the corresponding representations.
5
Copy the ResultUse the converted number in programming, math, or computer-science work.

Frequently Asked Questions

Hexadecimal (Base 16) is heavily used in computing, particularly for color codes (like #FFFFFF) and memory addresses, because it provides a human-friendly way to represent binary data. One hex digit represents exactly 4 bits (a nibble).

Computers use binary (Base 2, zeroes and ones) because they are built using microscopic transistors that only have two states: ON (1) or OFF (0).

The calculator is strictly typed. If you attempt to type a '9' into the Octal field (which only accepts 0-7), or a 'G' into the Hexadecimal field (which only accepts 0-9 and A-F), it will simply ignore the invalid input.

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