UpdateAreaCalcs Revit API Addin from dp StuffUpdateAreaCalcs 2014 Revit Addin from dp Stuff operates on Room or Areas and can do simple arithmetic calculations with any 2 numeric parameters that have values assigned to them and push results into another Non Read-Only┬ánumeric parameter. You will also be able to control how the results are rounded via Rounding Options. Pretty straight forward – and much better than going over every single area or room and assign values manually. Hopefully it will save you some time for a beer on Friday afternoon!