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To do that, you need to create a document level script. How you do that depends on which version of Acrobat you are using. In Acrobat 9, use Advanced>Document PRocessing>Document JavaScripts..., in Acrobat X use the Tools panel and select JavaScript>Document JavaScripts. When the dialog pops up, specify a name for your script (e.g. "ReCalcForm") and click on the Ad button. This will bring up the editor window. Remove the three lines that are filled in by default and replace them with the following line:
this.calculateNow();
This script will get executed when the form loads and will force a recalculation.