<div>
=SUM(IF(ISERROR(1/A1:A10),<wbr />0,1/A1:A10<wbr />))<br />
<br />
This is an array formula, so enter with Ctrl + Shift + Enter<br />
<br />
HTH<br />
Darren
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=SUM(IF(ISERROR(1/A1:A10),0,1/A1:A10))

This is an array formula, so enter with Ctrl + Shift + Enter

HTH
Darren

<div>
I get an error when I enter. &nbsp;It highlite the 0 in the formula.<br />
<br />
Bob
</div>


I get an error when I enter.  It highlite the 0 in the formula.

Bob

<div>
I cannot upload the entire workbook so I created a value only version of the sheet. &nbsp;I am attempting to enter the formula in U5.<br />
<a href="https://filedb.experts-exchange.com/incoming/2008/04_w16/18443/Test.xls" target="_blank" class="file-inline" title="Test page (139 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Test.xls</a>
</div>


I cannot upload the entire workbook so I created a value only version of the sheet.  I am attempting to enter the formula in U5.
Test.xls [https://filedb.experts-exchange.com/incoming/2008/04_w16/18443/Test.xls]

Test.xls

<div>
You've missed a &quot;)&quot;<br />
<br />
Should be &nbsp; =SUM(IF(ISERROR(1/BC5:BJ5)<wbr />,0,1/BC5:B<wbr />J5))
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You've missed a ")"

Should be   =SUM(IF(ISERROR(1/BC5:BJ5),0,1/BC5:BJ5))

<div>
Thanks. &nbsp;I guess I've been staring at this thing for too many days.
</div>


Thanks.  I guess I've been staring at this thing for too many days.

<div>
No problem, I know the feeling, I assure you!<br />
<br />
Cheers for the grade!<br />
Darren<br />
<br />

</div>


No problem, I know the feeling, I assure you!

Cheers for the grade!
Darren



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<div class="content wysiwyg-content">
Hi All:<br />
<br />
Is there a function that will sum the inverse of a range of cells, which also allows for zeros as some of the values? &nbsp;The same as: 1/A1 + 1/B1 + ... +1/H1 &nbsp;and allow for a 0 value in B1 &amp;&nbsp;E1.<br />
<br />
Bob
</div>
</div>


Hi All:

Is there a function that will sum the inverse of a range of cells, which also allows for zeros as some of the values?  The same as: 1/A1 + 1/B1 + ... +1/H1  and allow for a 0 value in B1 & E1.

Bob

Is there a sum inverse function?

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.