How to calculate kitchen square footage
To calculate kitchen square footage, multiply the kitchen length by its width and include the floor under cabinets and the island. The Kitchen Square Footage Calculator returns that full floor area in square feet (ft²) for flooring takeoffs.
Measure wall to wall at floor level. Do not subtract cabinet footprints when flooring continues under base cabinets. For an L-shaped or galley plan with a bump-out, split the floor into rectangles and add the sections.
A typical kitchen falls near 100 to 200 square feet. Small kitchens can be about 70 square feet, and large kitchens exceed 200 square feet. Measure the built space instead of relying only on a brochure label.
Measuring countertops and backsplash
Countertop area equals each run length times depth. A common countertop depth is about 25 inches, or 2.1 feet. Backsplash area equals length times height, and a common backsplash height is about 18 inches, or 1.5 feet.
Measure each straight run separately, including peninsula returns and island tops. Add the run areas for total countertop square footage. For backsplash, measure along the finished wall length behind the counters and multiply by the splash height.
A 10-foot run of standard 18-inch backsplash is about 15 square feet (10 × 1.5). Use the tile calculator for tile piece counts and the wall calculator when openings interrupt a splash wall.
Countertops: linear feet vs square feet
Fabricators often measure countertop runs in linear feet along the front edge, then multiply by depth to price the surface in square feet. Both units appear on quotes, so the same run can show as 10 linear feet and about 21 square feet at a 2.1-foot depth.
Linear feet describe the length of the run. Square feet describe the slab area after depth is applied. Islands and overhangs add area even when the wall run length stays the same.
Record length and depth for every run before comparing bids. Convert inches to feet (25 inches ≈ 2.1 feet) so the calculator and the fabricator sheet use the same units.
Estimate flooring for a kitchen
Kitchen flooring uses the full floor square footage, including under cabinets and the island, then adds about 10% waste for cuts. Convert the area to square meters with × 0.0929 when a quote uses m².
A 150-square-foot kitchen equals 13.9 m² or 16.7 yd².
Use the square yards calculator for any area.
Open the flooring calculator for waste and box coverage after the floor area is known. Keep countertop and backsplash quantities on separate lines so flooring waste is not applied to stone or tile splash orders.
If an island sits on a different finish, calculate the island footprint separately and subtract it from the main floor only when that island finish replaces the room flooring.
Kitchen square footage calculator summary
The Kitchen Square Footage Calculator finds kitchen floor area as length × width, including under cabinets and islands. Countertop area uses run length × depth (about 25 inches), and backsplash area uses length × height (about 18 inches).
Fabricators read linear feet of run and convert to square feet with depth. Convert floor area for material quotes, then use the linked flooring and tile tools for order quantities.