You need to calculate your sum in a worksheet before plotting it. Even
values from the same sheet have to be added first; Excel's charts don't do
arithmetic.

- Jon
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Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
http://PeltierTech.com
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"Dizzy Des" wrote in message
...
I want to add data from 2 different sheets within the same work book added
together. ie say data from Sheet1 B1 + Sheet 3 B1 as source data for the
same
bar on the chart. Can this be done direct or do I have to add them
together
first then use that as the source data.
I have tried typically the following: Sheet1!$B$1+Sheet3!$b$1 and several
variations of this without success.