The Formula: Length × Depth ÷ 144
Measure each run in inches, multiply length by depth, and divide by 144. Add the pieces together, and round up a little for overhangs.
A Wall Run
A 10-foot run at a typical 25.5-inch depth: 120 × 25.5 ÷ 144 = about 21.25 sq ft.
An Island
An 8 by 4-foot island top: 96 × 48 ÷ 144 = 32 sq ft, including the seating overhang.
A Full Backsplash
Stone up the wall is measured the same way and added to the total square footage.



