Bodnar & Sons Granite Countertop Diagram 609.695.7214 How To Calculate the Square footage of countertops Notes: - Standard width of countertop = 26 inches - Standard height of splash = 4 inches A. Square inches of splash    - Length of back splash + Length of end splash = total splash length    - Total splash length x 4 in = sq in of splash B. Square inches of countertop    - Length of counter x 26 in = sq in of countertop C. Square inches of bar area    - Length of bar at longest point x Width of bar at widest point = sq in of bar Total square footage = (A + B + C) divided by 144 Call Bodnar & Sons Marble & Granite today for a free estimate, 609.695.7214. Serving New Jersey an Pennsylvania Areas.