XL Help tells you why the answer is wrong - you are limited to 10 bits
and the msb is the sign bit. Chop the number up into bytes (8 bits)
and treat each part separately, remembering to multiply by 256 for the
upper byte.

Hope this helps.

Pete

On Dec 15, 5:13*pm, Mike H wrote:
Hi,

Well I think it's 822 and my calculator confirms that and like you I get
-202. Someone will no doubt explain why but in the meantime use this

=SUMPRODUCT(MID("0"&A1,ROW(INDIRECT("1:"&LEN("0"&A 1))),1)*2^(LEN("0"&A1)-RO*W(INDIRECT("1:"&LEN("0"&A1)))))

Where your binary number is in A1

Mike



"ahmedmidany" wrote:
Hello All,

I need your help, i want to convert large binary numbers using excel
but whenever i use the BIN2DEC function the result is negative which
is not correct.

Ex. BIN2DEC(1100110110) the result is -202 but if i use the calculator
the result is 822 which is the correct value

Any ideas? what shall i do to have the correct value?

Thanks in advance
A.M.
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