This supplemental calculator Excel file only seems to create problems every time I used it! Right now, I'm trying to document the prescriptive method for toplighting, but the floor area isn't registering and summing in the total. I put in the floor area the skylight covers, the area of the skylight, and the Tvis but nothing is happening. The spreadsheet caclulates the skylight coverage percentage, but nothing happens in the "toplighted area subtotal" column. Anyone know what else I need to do for this? I have used the calculator before using the simulation and sidelighitng prescriptive options, so I'm not sure what is wrong this time.

Thanks!