How do you convert binary to decimal?

Read from right to left, multiply each bit by 2^position and sum. Example: 1011 = 1×8 + 0×4 + 1×2 + 1×1 = 11. Or use this calculator!

What is hexadecimal used for?

Hex is used in programming, web colors (#FF5733), memory addresses, and low-level computing because each hex digit represents exactly 4 bits.

Binary to Decimal Converter

Enter a binary, decimal, octal, or hex number to convert it to all other bases instantly.

Convert any number between binary (base 2), decimal (base 10), octal (base 8), and hexadecimal (base 16). Enter a value in any base and instantly see all four representations.

Last reviewed: April 2026Report an error

Input Base

Value to Convert

Decimal

255

Decimal: 255 | Binary: 11111111 | Octal: 377 | Hex: FF

Decimal (Base 10)

255

Binary (Base 2)

11111111

Octal (Base 8)

377

Hexadecimal (Base 16)

How to Use This Binary/Decimal Calculator

Select the base of your input number (binary, decimal, octal, or hex).
Enter your number.
Read the equivalent in all four number bases.

Frequently Asked Questions

: Read from right to left, multiply each bit by 2^position and sum. Example: 1011 = 1×8 + 0×4 + 1×2 + 1×1 = 11. Or use this calculator!
: Hex is used in programming, web colors (#FF5733), memory addresses, and low-level computing because each hex digit represents exactly 4 bits.

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Binary to Decimal Converter

How to Use This Binary/Decimal Calculator

Frequently Asked Questions

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