Convert binary to decimal and back, instantly, as you type in either box — with digit validation so stray characters never slip through.
Binary to Decimal Converter
Conversion check
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How it works: Binary is base 2: each digit is a power of two. Reading 1010 left to right gives 1×2³ + 0×2² + 1×2¹ + 0×2⁰ = 8 + 0 + 2 + 0 = 10. To go the other way, divide the decimal number by 2 repeatedly and read the remainders upwards. Negative and fractional values are out of scope for this simple converter.
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Estimates only — results depend on the values you enter and the standard formulas shown above.