Countertop Square Foot
Calculator — Surface Area Tool

Measure each straight section of countertop in inches (length and depth), multiply to get square inches, then divide by 144 to convert to square feet. Add all sections together. A countertop section 96 inches long and 25.5 inches deep is 2,448 sq in or 17 sq ft.

A typical kitchen countertop ranges from 25 to 50 square feet, depending on the kitchen layout. An average L-shaped kitchen has about 30-40 sq ft of countertop surface.

Granite countertops cost $40 to $100 per square foot installed, depending on the stone grade and edge profile. Budget granite starts at $40/sq ft, mid-range at $50-75/sq ft, and premium exotic granite at $75-100+ per sq ft.

Split the L-shaped countertop into two rectangular sections. Measure the length and depth of each section, calculate the area of each, and add them together. Use the L-Shape option in the calculator.

Standard kitchen countertop depth is 25 to 25.5 inches (about 2.125 feet). Island countertops may be deeper at 27 to 30 inches. Bathroom vanity countertops are typically 22 inches deep.

Quartz countertops cost $50 to $120 per square foot installed. Entry-level quartz starts at $50/sq ft, mid-range at $65-85/sq ft, and premium brands at $85-120/sq ft.