Free online tool
Number Base Converter
Convert values among binary, octal, decimal, and hexadecimal.
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How to use this tool
Enter the value, select the base it is written in and convert it. Check that its digits are valid for the selected input base.
What to check
A base conversion changes representation, not the underlying value. Do not assume support for fractions, signed encodings or fixed-width overflow unless the interface explicitly provides it.
What does binary 1010 represent in decimal?
It represents 10: one eight plus one two. The place values in binary are powers of two.