Kitchen Countertop Area Planner
Measure the counter space you can see. If the two lengths both include the same corner, deduct that shared rectangle once—not twice. Add a separate island only when it is not included in either run.
How to avoid measuring an L-shaped corner twice
Imagine one 96-by-25.5-inch counter and a second 60-by-25.5-inch run. If both measurements contain the same 25.5-inch-square corner, their areas add to more than the countertop actually occupies. Deducting that one shared square leaves about 23.11 square feet for the L shape. A separate 48-by-36-inch island adds 12 square feet, for a total footprint of about 35.11 square feet.
If you measured the second run from the inside corner so the shared portion was already excluded, set both shared-corner fields to zero. Never deduct a corner merely because your kitchen has an L shape: deduct only a rectangle that was counted in both input measurements.
Why a sink cutout does not automatically reduce the slab order
The sample L shape has a 23.11-square-foot visible countertop footprint after deducting the common corner; the separate island adds 12 square feet, yielding a total of 35.11 square feet. Now imagine a 30-by-20-inch sink opening within one run. Its geometric area is 600 ÷ 144 = 4.17 square feet. Subtracting it would make the worksheet show roughly 30.94 square feet, but that is not a defensible quantity to order from a slab fabricator.
The sink hole is normally removed from a larger piece that still has to be cut from stock. Whether any offcut can be reused depends on stock size, orientation, veining, seam placement, structural limits around the opening and the fabricator's plan. Keep the full 35.11-square-foot footprint as a preliminary geometric brief, and mark the sink opening separately rather than pretending every hole reduces purchased material by its full area.
Give each bidder the same four facts
- Run A and B measurements, including whether both contain the shared corner; include a sketch showing which rectangle you subtracted once.
- Island length, depth and requested overhangs, labeled separately from the main L shape.
- Sink, cooktop, outlet and faucet locations with their actual models; these affect cutouts and support, not just apparent square footage.
- A request to identify whether the quote prices net installed area, full slabs, fabricated pieces or material plus labor, and to itemize sink/cooktop cutouts, edge profiles, seams, delivery and removal.
This is a comparison checklist, not an assurance that any fabricated seam, unsupported overhang or cutout clearance is safe. A qualified fabricator must verify templates and support details before manufacture.
Before you ask for an installed-price quote
This figure is a floor-plan footprint, not a slab cutting layout or final fabricator template. It does not subtract a sink cutout from the amount of slab you must purchase. Material yield, veins, seam placement, edge profiles, overhangs, site tolerances, labor and removal can all change the installed cost. Use the countertop measuring and quote checklist to prepare the questions to ask; then record itemized prices in the Kitchen Remodel Cost Calculator or Project Budget Workspace. Have a fabricator verify final dimensions before ordering.