Depending on your comfort level with XL, you may or may not find it
easy to adapt Stephen Bullen's example of a variable width chart to
your needs (funchrt5 in
http://www.oaltd.co.uk/Excel/SBXLPage.asp#Charting).

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Regards,

Tushar Mehta
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions

In article ,
says...
Is anybody aware of a free tool that supports easy graphing of Marimekko
Charts in Excel ...?