Countertop Square Footage Calculator
Square feet of countertop for quotes and slab orders: measure each section in inches, add the island and backsplash, and see the cost at your installed price per square foot.
Countertop sq ft = length (in) × depth (in) ÷ 144 for each section. A standard counter is 25½ in deep, so every 10 ft (120 in) run is 21.25 sq ft; a 4 in backsplash adds 3.3 sq ft per 10 ft. Measure L-shapes as two sections with the corner counted once.
Square feet for common countertop runs (25½ in deep)
| Run length | Counter | + 4 in backsplash |
|---|---|---|
| 60 in (5 ft) | 10.6 sq ft | 12.3 sq ft |
| 72 in (6 ft) | 12.8 sq ft | 14.8 sq ft |
| 96 in (8 ft) | 17.0 sq ft | 19.7 sq ft |
| 120 in (10 ft) | 21.3 sq ft | 24.6 sq ft |
| 144 in (12 ft) | 25.5 sq ft | 29.5 sq ft |
| 180 in (15 ft) | 31.9 sq ft | 36.9 sq ft |
Common island sizes
| Island | Square feet |
|---|---|
| 48 × 36 in | 12.0 |
| 72 × 36 in | 18.0 |
| 84 × 42 in | 24.5 |
| 96 × 42 in | 28.0 |
| 108 × 48 in | 36.0 |
Frequently asked questions
How do you measure countertops for square footage?
Measure each straight section's length and depth in inches along the back wall, multiply length × depth and divide by 144. For an L or U shape, measure one leg to the wall and the other leg from the edge of the first, so the corner isn't counted twice.
What is the standard countertop depth?
About 25½ in for base cabinets (24 in cabinets plus a 1½ in overhang). Islands are often 36–42 in deep, or more with seating.
Do you include the sink cut-out in square footage?
No. Fabricators price the full slab area including sink and cooktop cut-outs, and often charge extra for each cut-out.
How much backsplash square footage do I need?
Multiply the length of counter against the wall by the backsplash height. A standard 4 in backsplash adds 1 sq ft for every 36 in of wall; a full-height tile backsplash is usually 18 in high.
How many square feet is a kitchen countertop?
Most kitchens have 30–50 sq ft of countertop, plus 10–30 sq ft for an island.
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Area = length × depth ÷ 144 (square inches per square foot). Standard depths reflect common U.S. base cabinet dimensions. Installed prices vary widely by material, edge and region; enter quotes from your fabricator.