Everyday Tools

What Is a Binary Number?

A binary number is a number written in base 2, using only the digits 0 and 1. Each position represents a power of 2, just as each position in a decimal number represents a power of 10. Computers use binary because electronic circuits easily represent two states, on and off.

Converting to Decimal

Binary 1011 = 1×8 + 0×4 + 1×2 + 1×1 = 11.

Bits and Bytes

Each binary digit is a bit; eight bits form a byte, which can represent 256 different values.

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🔗 Related Terms

Hexadecimal Data Storage Units (KB, MB, GB, TB) Roman Numerals

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Last updated: September 29, 2026. This definition is for general educational purposes only. It is not financial, investment, tax, legal, or medical advice, and it does not recommend any product or course of action. For decisions about your own situation, consult a qualified professional.