When you paste an Excel chart into Word, you get the Excel workbook too. That's why each one's so large. If you paste as links or as pictures, the increase will be much less. You can minimise the increase with Chart objects by creating the charts from workbooks containing only the charts and the data they rely on, rather than from workbooks that contain lots of extra data, formulae, worksheets, charts, etc.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]