Lots of info about calculation (options) in Excel can be found on Charles Williams' site:

www.decisionmodels.com

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Kind regards,

Niek Otten
Microsoft MVP - Excel

"St@cy" wrote in message ...
|I have a pretty elaborate workbook that seems to be calculating all the time,
| even when new data is not being entered. It's starting to slow things down.
| Please explain the calculation options and give me some suggestions.
|
| Thanks.