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Binary to Decimal Converter

Binary is how computers store numbers, but people read decimal. This converter turns any string of 0s and 1s into its everyday base-10 value. Everything runs locally in your browser.

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Binary (base 2) in, Decimal (base 10) out.

How it works

By hand, add the place values where a 1 appears — from the right they double: 1, 2, 4, 8, 16… So 1011 is 8 + 2 + 1 = 11.

Examples

FAQ

How do I convert binary to decimal?

By hand, add the place values where a 1 appears — from the right they double: 1, 2, 4, 8, 16… So 1011 is 8 + 2 + 1 = 11. Or just paste your binary value into the box above and the decimal result appears instantly.

Does this Binary to Decimal converter run in my browser?

Yes. The conversion happens entirely client-side — nothing you type is uploaded — and it uses big-integer math, so even very long binary numbers convert exactly.

What is the largest number I can convert?

There is no practical limit. Because the converter works with arbitrary-precision integers, a binary value of any length converts without rounding or overflow.

Need other bases, custom radixes, or two-way editing? Use the full Number Base Converter.

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