A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
% Budget Variance = Difference/budgeted amount
As you state your preference, you would want (Budget-Actual)/Budget
this would give a negative if the Actual is greater than the budget and positive if the Actual is less than the budget. It would return a proportion. If formatted as a percent, then it will display a percent.
formatting has 4 parts
positive format;negative format;format for zero;Text
so you can design your format to display what you want.
If I select a cell, right click and select format cells, then choose number tab and then custom and put in this format
0.0%;[Red]-0.0%;0%;
then it should approach what you describe. (make the normal font color of the cell the blue you want to see for positive).
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Regards,
Tom Ogilvy