To measure the area of the countertop you need to buy, first measure the countertop length in inches, adding 1 1/2 inches of overhang at each end. Divide the length by 12 to calculate the linear feet of your countertop. Then, use the same process to measure your countertop’s depth (it’s usually 25 inches or 25 5/16 inches) in linear feet, being sure to account for your cabinets and overhang. Then, multiply the linear feet of the depth and width to get the square footage of your countertop.
Depending on the material of your countertop, it might need to be replaced within 10 or 15 years. But more durable options, such as concrete, marble, or stainless steel, can last for much longer—50 years or even more with proper maintenance.
Depending on the size of the project, the material you’re using, and the installation method, professional countertop installers usually complete a replacement project in one to three days, including the time needed to remove the old countertop.
Generally, labor for kitchen countertop replacement costs between $15 and $25 per square foot, though this might increase for special materials, like porcelain or poured-in-place concrete.