Binary to Decimal Converter_
Convert base-2 numbers to decimal. Runs entirely in your browser — nothing you paste here is uploaded or logged.
100% client-side — nothing you enter leaves your browser. Free, no signup, no tracking.
How to use
- 01Type or paste a binary number — spaces between groups are fine, and a
0bprefix is accepted. - 02The decimal conversion appears live, like a binary to decimal calculator without the extra clicks.
- 03Copy the result, or toggle grouping to make long outputs readable.
About this binary to decimal converter
Here is how binary to decimal conversion works: each bit is a power of two, read right to left. So 101 in binary to decimal is 1×4 + 0×2 + 1×1 = 5, and 1111 is 15. To convert binary to decimal manually, add up the powers of two wherever there is a 1 — this translator just does the same arithmetic exactly, using big integers so even values hundreds of bits long convert without rounding.
Note on negative numbers: input here is treated as an unsigned magnitude with an optional minus sign, not as two’s complement. A signed byte like 11111111 therefore reads as 255, not −1 — if you need signed interpretation, that distinction matters. Conversion happens entirely in your browser.