Countertop Square Footage Calculator

Draw your countertop layout and the calculator totals the square footage for you, including islands and backsplash. Add sink and cooktop cutouts, choose an edge profile and a quartz color, download a blueprint and see an instant estimate.

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Select a drawing tool and click & drag to create shapes

Use precise measurements in the properties panel

How to calculate countertop square footage

Countertops are priced by the square foot, so an accurate measurement is the first step to a realistic quote. The calculator above does the math as you draw, but here is how it works if you want to check it by hand.

  1. Split the layout into rectangles. Treat each straight run, the island and any peninsula as its own rectangle.
  2. Measure length and depth in inches. Standard kitchen countertops are about 25½ inches deep. Measure islands and bars at their actual size, including any overhang.
  3. Multiply length by depth for each rectangle to get square inches.
  4. Divide by 144 to convert square inches to square feet, then add the pieces together.
  5. Add the backsplash separately. Multiply the length of each backsplash wall by its height (a standard backsplash is 4 inches tall) and divide by 144.

Worked example: L-shaped kitchen with an island

Run 1: 120″ × 25.5″ = 3,060 sq in

Run 2: measure it from the wall to the edge of run 1 so the corner isn’t counted twice: (96″ − 25.5″) × 25.5″ = 1,798 sq in

Island: 72″ × 36″ = 2,592 sq in

Countertops: 3,060 + 1,798 + 2,592 = 7,450 sq in ÷ 144 = 51.7 sq ft

4″ backsplash on both walls: (120″ + 96″) × 4″ = 864 sq in ÷ 144 = 6 sq ft

Fabricators cut your countertops from full slabs, so the number of slabs your layout needs also affects the price. That’s why a final quote is confirmed when we template your space.

Countertop square footage FAQs

How do I calculate countertop square footage?

Measure each section’s length and depth in inches, multiply them, divide by 144, and add the sections together. The calculator above does this automatically as you draw your layout.

What is the standard countertop depth?

Standard kitchen countertops are about 25½ inches deep, which covers 24-inch base cabinets with a small overhang at the front. Bathroom vanity tops are usually shallower.

Does the backsplash count toward countertop square footage?

Measure it separately. A standard 4-inch backsplash is usually cut from the same slab, so it adds to the material you need. Full-height backsplashes add much more.

How do I measure an L-shaped or U-shaped countertop?

Split it into rectangles. Measure one run at full length, then measure the next run from the wall to the edge of the first one so the corner square isn’t counted twice.

Do sink and cooktop cutouts reduce the square footage?

No. The countertop is cut from a full piece of stone, so square footage is measured before cutouts. Cutouts are usually priced separately.

Have your square footage? Estimate your quartz cost, browse 500+ countertop colors, or book a free in-home estimate and we’ll measure it for you.

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