This countertop calculator measures your kitchen the way fabricators quote it: counter runs at standard depth, islands, and backsplash area — totaled in square feet with a waste allowance, ready to price against per-square-foot material rates.

Counter Runs–
Backsplash–
Total with Allowance–

Fabricators quote differently: slab materials (granite, quartzite, marble) are priced by the slab and its yield; sheet/engineered materials (quartz, solid surface, laminate) quote by finished square footage — this total. Sink and cooktop cutouts are usually billed as separate line items (or not deducted at all), so this measure intentionally doesn’t subtract them.

How Fabricators Measure (and Where Quotes Diverge)

The anchor facts: base cabinets are 24 inches deep, countertops overhang to ~25.5 inches; islands quote at face dimensions (with waterfall ends billed as their own panels); and seams, cutouts and edge profiles are fabrication charges, not area. Two quotes for the same kitchen can legitimately differ 15% on measurement conventions alone — normalizing them against one honest square footage (this page) is the homeowner’s countermove. Tile backsplashes instead? Measure with our Tile Calculator. Part of our Construction Calculators collection.

Worked Example (Verified)

The widget’s kitchen: 10 ft of runs, a 6 × 3 ft island, 4-inch backsplash on the runs:

  • Runs: 10 × (25.5 ÷ 12) = 21.25 sq ft
  • Island: 18 sq ft · Backsplash: 10 × (4 ÷ 12) = 3.3 sq ft
  • Subtotal 42.6 sq ft → with the 10% layout allowance: ≈ 46.8 sq ft to price (at $75/sq ft installed for a mid-range quartz, ≈ $3,500 before cutout and edge extras)
  • Full-height backsplash (18 in) instead adds 15 sq ft — a $1,100 swing on the same kitchen, which is why “backsplash to the cabinets or to the ceiling?” is a budget question

Quote-Reading Notes

  • Slab yield math: a typical granite slab is ~55–65 sq ft usable; kitchens crossing a slab boundary jump in price in steps, not slopes — a smaller island can be one slab instead of two.
  • Seams are sometimes avoidable by layout (run direction) — ask where they’ll fall; a seam at the sink is standard and nearly invisible in busy stone.
  • Remnants (leftover slab pieces sold cheap) are the budget hack for vanities and small kitchens — measured here, shopped locally.
  • Edge profiles: eased/pencil edges are commonly included; ogee and waterfall builds are fabrication line items measured in linear feet.

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Frequently Asked Questions

How do I measure countertops in square feet?

Each run: length (ft) × depth (ft) — standard depth is 25.5 in = 2.125 ft, so a 10-ft run is 21.25 sq ft. Add islands at their face dimensions and backsplash as length × height. The example kitchen totals 42.6 sq ft before allowance.

Are sink and stove cutouts subtracted?

Usually not from the billed area — the material is cut away but the slab was consumed, and cutouts are often charged as fabrication instead. Don’t let a quote both bill full area AND premium cutout fees without explanation; one or the other is the market norm.

How much overage should I budget beyond the square footage?

Quotes typically run 10–20% above raw material rate × area, covering templating, seams, edges, cutouts and installation. The 10% allowance here is a measuring cushion, not the installed multiplier — get the line items and compare totals, not rates.

What is a standard countertop depth?

25.5 inches for base-cabinet runs (24-inch cabinets plus overhang and a small reveal), 24–27 inches varies by design; islands range 36–48+ inches deep. Bar overhangs for seating add 12–15 inches of depth on the stool side.

Quartz or granite — does measurement differ?

The finished area is identical; the pricing model differs. Engineered quartz quotes by finished sq ft fairly transparently; natural stone prices by slab, so your area matters through slab-yield fit — two kitchens of equal footage can take one slab or two.

Is this countertop calculator free?

Yes — free, instant, no sign-up.