How do you calculate countertop square footage?

Measure length and depth in inches, multiply together to get square inches, then divide by 144 to get square feet. For L-shaped kitchens, calculate each run separately and add the totals.

How many square feet is a typical kitchen countertop?

The average kitchen countertop in the US is 25 to 35 square feet. Small kitchens can be 15 to 20 sq ft while large L-shaped or U-shaped kitchens with islands often exceed 50 to 80 sq ft.

How much does a quartz countertop cost per square foot?

Quartz countertops cost $55 to $120 per square foot installed in 2026. Budget quartz runs $55 to $70 per sq ft, mid-range is $70 to $95, and premium quartz with exotic colors can reach $120 or more.

What is the cheapest countertop material?

Laminate is the most affordable countertop material at $20 to $50 per sq ft installed. Butcher block is the next most affordable at $35 to $80 per sq ft.

Does countertop square footage include the sink cutout?

Fabricators typically charge for the gross area including the sink cutout since the cutout material is wasted. However, the net area after deductions is useful when comparing material costs per square foot.

How do I calculate square footage for an L-shaped countertop?

Divide the L-shape into two rectangles. Measure each run length times depth separately in inches, add the totals, then divide by 144. Do not double-count the corner area.

Countertop Calculator — Square Footage & Cost Estimator (2026)

2026 cost data updated

Countertop
Calculator

Get exact square footage for any kitchen layout — rectangular, L-shaped, or U-shaped — plus instant cost estimates for granite, quartz, laminate, concrete, and more.

100% free, no sign-up L-shape & sink deduction 6 materials priced

Countertop · Quick Facts US · 2026

Avg kitchen sq ft

$75

Quartz avg / sq ft

$40

Laminate avg / sq ft

±10%

Calc accuracy

Cost ranges based on US national averages including materials + installation · May 2026

Calculates

Square footage Linear feet L-shape & U-shape Sink deduction Cost by material

Tool

Countertop Calculator

Choose your countertop shape, enter dimensions in inches or feet, and get sq footage instantly. Switch to the Cost tab to price out your project by material.

Countertop Estimator Free · Instant · No sign-up

Countertop shape

Main run

Length (inches)

Depth / Width (inches)

Optional deductions

Deduct sink / cooktop cutout

Cutout length (inches)

Cutout width (inches)

ℹ️ Standard countertop depth is 25½" (25.5"). Most kitchen runs are 96"–120". Measure to the wall, not to cabinets.

—

square feet

—

sq in total

Raw area

—

linear ft

Total run length

—

slabs (est.)

At 55 sq ft/slab

Square footage (from calculator above, or enter manually)

Project tier

ℹ️ Costs include materials + installation. Excludes demo, plumbing reconnection, and backsplash. US national averages — 2026.

—

📌 Cost note: These are national average ranges for materials + professional installation. Prices vary significantly by region, edge profile, cutouts, and supplier. Always get 3 quotes before committing.

Guide

How to Measure Countertop Square Footage

Accurate measurements prevent over-ordering expensive slabs or running short mid-project. Here's the exact method fabricators use.

Rectangular countertop

The simplest case. Measure the full length of the countertop run (wall to wall, not just the cabinet run) and the depth from the wall to the front edge including the overhang. Standard depth is 25½" (25.5 inches), which includes the 1½" overhang past the cabinet face.

Rectangle formula

Sq ft = (Length × Depth) ÷ 144 // Example: 96" × 25.5" ÷ 144 = 17 sq ft

L-shaped countertop

Measure each run separately and add them together. Be careful not to double-count the corner — measure Run A from wall to wall, then measure Run B from the inner wall to the outer wall (excluding the corner already counted in Run A).

L-shape formula

Total sq in = (A_len × A_dep) + (B_len × B_dep) Sq ft = Total sq in ÷ 144

Sink and cooktop deductions

Fabricators charge for the full slab including cutouts (they can't reuse the cutout material). However, knowing the net usable area is useful when comparing materials by the square foot. A standard undermount kitchen sink cutout is approximately 30" × 18" (3.75 sq ft).

⚠ Fabricator pricing tip When getting quotes, ask whether the price is per sq ft of gross slab (full area including cutouts) or net finished area. Most charge for the gross area. Our calculator shows both.

Standard countertop dimensions

Depth: 25½" (25.5") — includes 1½" overhang
Height: 36" from floor (standard kitchen)
Bathroom depth: 19"–22"
Island depth: 42"–48" (varies)
Overhang for seating: 12"–15"
Slab size: ~55–65 sq ft per slab (varies by supplier)

📏

Measure twice

Always measure from wall to wall, not cabinet to cabinet. Walls are rarely perfectly square — measure at multiple points and use the largest dimension.

➕

Add 10–15% waste

Stone slabs have natural variation and fabricators need material for cuts. Add 10% for simple rectangular layouts, 15–20% for L-shapes, diagonals, or book-matched patterns.

🔢

Round up to slabs

Slabs come in fixed sizes (~55 sq ft). Even if you need 58 sq ft, you're buying 2 slabs. Always calculate slab count to understand the true material cost.

Materials

Countertop Cost by Material (2026)

Installed cost ranges per square foot across the most popular countertop materials in the US market. Prices include materials and standard installation.

Quartz

$55–$120 / sq ft installed

Engineered stone — most popular choice in US kitchens. Extremely durable, non-porous, consistent color. Requires no sealing.

Non-porous Low maintenance Mid-High cost

Granite

$45–$110 / sq ft installed

Natural stone with unique veining. Extremely hard and heat resistant. Requires annual sealing to prevent staining.

Heat resistant Needs sealing Mid-High cost

Laminate

$20–$50 / sq ft installed

Most affordable option. Modern laminates convincingly mimic stone. Not heat or scratch resistant — avoid cutting directly on surface.

Budget friendly Not heat safe Easy install

Concrete

$65–$150 / sq ft installed

Custom, artisanal look. Fully customizable with embedded objects, color, texture. Heavy — requires cabinet reinforcement. Needs regular sealing.

Fully custom Heavy High cost

Marble

$60–$180 / sq ft installed

Timeless luxury material. Beautiful but porous — prone to etching from acids (lemon juice, wine). Best for low-traffic areas or bakers' counters.

Luxury look High maintenance High cost

Butcher Block

$35–$80 / sq ft installed

Warm, natural wood aesthetic. Great for food prep — gentle on knives. Requires regular oiling and is susceptible to water damage near sinks.

Warm aesthetic Needs oiling Mid cost

Material	Budget ($/sq ft)	Mid-range	Premium	Durability	Maintenance	Sealing needed
Quartz	$55–$70	$70–$95	$95–$120	Excellent	Low	No
Granite	$45–$65	$65–$90	$90–$110+	Excellent	Medium	Annual
Laminate	$20–$30	$30–$40	$40–$50	Fair	Low	No
Concrete	$65–$90	$90–$120	$120–$150+	Good	High	Frequent
Marble	$60–$90	$90–$130	$130–$180+	Fair	High	Frequent
Butcher Block	$35–$50	$50–$65	$65–$80	Good	Medium	Monthly oil

FAQ

Frequently asked questions

Common questions about countertop square footage, cost estimation, and measurement.

Measure the length and depth of your countertop in inches, multiply them together to get square inches, then divide by 144 to convert to square feet. For example, a 96" × 25.5" countertop = 2,448 sq in ÷ 144 = 17 sq ft. For L-shaped or U-shaped kitchens, calculate each run separately and add the results. Use the calculator above for instant results.

The average kitchen countertop in the US is 25–35 square feet. Small galley kitchens can be as low as 15–20 sq ft, while large L-shaped or U-shaped kitchens with islands often exceed 50–80 sq ft. A quick rule of thumb: multiply the total length of all your runs (in feet) by 2.125 (standard 25.5" depth in feet) to estimate square footage.

Divide the L-shape into two rectangles. Measure each run (length × depth) separately in inches, add the totals, then divide by 144. Key tip: don't double-count the corner. If Run A is measured wall to wall, measure Run B from the inside wall outward, not wall to wall — otherwise you count the corner area twice. The calculator above handles this automatically.

It depends on the context. Fabricators typically charge for the gross area including the sink cutout, because they still cut the full slab and the cutout piece is wasted. However, when comparing costs per sq ft, it's useful to know the net area. Our calculator shows both the gross area and the net area after sink deductions. Always confirm with your fabricator which measurement they use for pricing.

Quartz countertops typically cost $55–$120 per sq ft installed in 2026. Budget quartz (entry-level colors, standard edge) runs $55–$70/sq ft. Mid-range is $70–$95/sq ft. Premium quartz with exotic colors or complex edges can reach $120+. The national average for a 30 sq ft kitchen is roughly $2,100–$3,600 installed. Prices vary significantly by region — expect to pay 20–30% more in high cost-of-living metro areas.

Granite countertops cost $45–$110 per sq ft installed in 2026. Entry-level granite (common colors like Santa Cecilia or Uba Tuba) starts around $45–$65/sq ft. Exotic or rare granite slabs with unique veining can reach $100–$150+/sq ft. Total project cost for an average 30 sq ft kitchen is $1,350–$3,300. Granite is often slightly less expensive than quartz at the entry level, but premium exotic granites can exceed premium quartz pricing.

Laminate is the most affordable countertop material, running $20–$50/sq ft installed. Modern laminate has improved dramatically — high-pressure laminate (HPL) with realistic stone or wood textures looks significantly better than older generations. Butcher block is the next most affordable at $35–$80/sq ft and offers a warm, natural look. If budget is the primary concern, laminate offers the best value; if you want a natural material, butcher block is the budget pick.

Linear feet simply measures the total length of all countertop runs end to end, regardless of depth. Add up the length of each run in inches, then divide by 12. For example, a kitchen with a 96" main run and a 72" side run = 168 total inches ÷ 12 = 14 linear feet. Linear feet is used mainly for laminate sheets and edge profiling costs, since both are priced by the linear foot rather than square footage.

A standard granite or quartz slab is approximately 55–65 sq ft (jumbo slabs can reach 70+ sq ft). Divide your total sq footage (including 10–15% waste) by 55 to estimate slab count. For example: 42 sq ft × 1.10 waste = 46.2 sq ft ÷ 55 = 0.84 slabs — meaning you need 1 slab. For book-matched patterns or large islands, you may need consecutive slabs from the same quarry lot to match veining. Our calculator shows the estimated slab count automatically.

Your countertop sq ft is the actual area you need covered, measured from your kitchen dimensions. Your slab sq ft is the total stone you need to purchase, which is higher than countertop sq ft because it includes: (1) the sink/cooktop cutout waste, (2) edge trimming, (3) a 10–15% overage buffer, and (4) potential seam placement adjustments. Always order slab sq ft, not countertop sq ft, when purchasing material.

More calculators

Related tools on grout-calculator.us

More free calculators for your home improvement projects.