How To Measure Countertops For Square Footage. Divide total square inches by 144 to determine square footage. To calculate square footage of countertops multiply length in inches times width in inches and divide it by 144.
Add the area of all sections together to determine total square inches. Take measurements of the entire length of each countertop you want covered in granite. 125” x 25” = 3125”.
Do not include areas where the countertop will not cover, such as oven ranges, in your boxes.
Take measurements of the entire length of each countertop you want covered in granite. ÷ 144 = total square feet: Write down the length of each segment as you measure them. Take measurements of the entire length of each countertop you want covered in granite.