How to measure countertops in square feet
Fabricators price stone and quartz by the square foot, so a good measurement is the first step to a fair quote. Break the counter into rectangles, measure each one, and take care not to count the corners twice. Here is the math with the values the calculator opens with: an L-shaped kitchen with a 10 ft run and an 8 ft run, standard 25.5 inch depth, a range in the 10 ft run, a 4 inch backsplash and one sink.
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1
Convert the depth to feet
25.5 inches ÷ 12 = 2.125 ft.
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2
Multiply each run by the depth
10 x 2.125 = 21.25 sq ft and 8 x 2.125 = 17 sq ft, so 38.25 sq ft. Measure both runs from the corner wall, the way you would stand a tape in the corner.
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3
Take out the corner and the range
Measured that way, the corner square is in both runs: 2.125 x 2.125 = 4.52 sq ft, counted once. A 30 inch freestanding range leaves 2.5 x 2.125 = 5.31 sq ft with no top. 38.25 − 4.52 − 5.31 = 28.42 sq ft of counter.
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4
Add the backsplash
The splash runs along both walls, less the range: 10 + 8 − 2.5 = 15.5 ft. At 4 inches tall (0.333 ft) that is 5.17 sq ft. The total is 33.6 sq ft.
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5
Price it
33.6 sq ft of mid-range quartz at $90 per sq ft installed is $3,023. A sink cutout ($150), removing the old tops ($200) and a plumber to reconnect the sink ($200) bring it to $3,573. The typical quartz range of $50 to $200 per sq ft puts the same job between $2,229 and $7,268.
For a U-shape, subtract one corner square for each of the two corners. An island is just length x width, with no backsplash. If your counter has a peninsula, measure it as an extra run. Add an inch or two to each run if the top overhangs an open end panel or a dishwasher at the end of a run.
Standard countertop dimensions
| Measurement | Typical size |
|---|---|
| Kitchen counter depth | 25.5 in (24 in cabinet + 1.5 in overhang) |
| Counter height | 36 in; bar height 42 in |
| Bathroom vanity depth | 19 to 22.5 in |
| Standard backsplash | 4 in tall |
| Full-height backsplash | about 18 in, up to the wall cabinets |
| Island seating overhang | 12 to 15 in, about 24 in of width per seat |
| Slab thickness | 2 cm or 3 cm (about 3/4 or 1 1/4 in) |
An overhang beyond about 10 to 12 inches on stone usually needs steel brackets or corbels; ask your fabricator what their slab and thickness allow. Older kitchens are not always square, so measure the depth at both ends of each run and use the larger number.
Cost by countertop material
Prices are per square foot installed, including fabrication, delivery and installation. The last column is the default kitchen above (33.6 sq ft with a sink cutout, tear-out and plumber) at the calculator's typical price.
| Material | Per sq ft installed | Default kitchen |
|---|---|---|
| Laminate | $15–$60 | $1,726 |
| Butcher block | $40–$100 | $2,901 |
| Solid surface | $40–$100 | $2,901 |
| Granite | $40–$150 | $3,405 |
| Concrete | $50–$120 | $3,405 |
| Quartz | $50–$200 | $3,573 |
| Marble | $50–$200 | $4,245 |
| Quartzite | $60–$200 | $4,581 |
Laminate is the budget pick and the easiest to replace, but it scorches and cannot take an undermount sink in most cases. Butcher block is warm and repairable; it needs oiling and keeps away from standing water. Solid surface allows seamless sinks and sands out scratches, but hot pans mark it. Granite handles heat well and should be sealed. Quartz needs no sealing and resists stains, but direct heat can discolor it. Marble etches from lemon juice and wine, which some owners love as patina and others hate. Quartzite is a natural stone harder than granite, priced near the top. Concrete is usually cast by a specialist and needs sealing.
What else goes into a countertop quote
- Cutouts: about $100 to $200 each for a sink, a cooktop or even a soap dispenser hole. The calculator uses $150.
- Edges: an eased or square edge is usually free. Bevel, half and full bullnose run about $10 to $15 per linear foot, ogee and mitered edges about $20 to $25, and a Dupont edge up to $40. The calculator prices bullnose at $12 and ogee at $22 per foot of exposed front edge.
- Tear-out: about $50 to $300 to pull and haul away the old tops. Old tile tops set in mortar sit at the high end.
- Plumbing: someone has to disconnect and reconnect the sink, faucet, disposal and dishwasher. Plumbers bill about $45 to $200 an hour; the calculator allows $200.
- Slab yield: stone shops sometimes sell whole slabs rather than square feet. A small kitchen that just spills onto a second slab can cost more than its square footage suggests, so ask how they price leftovers.
Countertops for common kitchen layouts
25.5 inch depth, 4 inch backsplash, range gap in the longest wall run except where noted. Tap a layout to load it into the calculator.
| Layout | Area | Quartz, installed |
|---|---|---|
| 8 ft straight, no range | 19.7 sq ft | $2,320 |
| 12 ft straight | 23.4 sq ft | $2,652 |
| 10 x 8 L-shape | 33.6 sq ft | $3,573 |
| 12 x 10 L-shape + 6 x 3 island | 61.4 sq ft | $6,078 |
| 10 x 8 x 8 U-shape | 48.7 sq ft | $4,937 |
DIY or hire a fabricator?
Prefab laminate and butcher block come in stock lengths at home centers, and a handy owner can cut, join and fasten them in a weekend with a circular saw, a jigsaw, clamps and a router. Stone, quartz and solid surface are a different trade. The shop sends someone to template the cabinets after they are set, cuts the slab on a bridge saw, polishes the edges and installs the pieces with a crew. A single long run of 3 cm stone can weigh several hundred pounds and crack if lifted wrong. That is why installed prices for stone barely change whether you do the demolition yourself or not.
Your part, even with a pro: have the cabinets level and secured before templating, pick the sink and faucet early (the shop needs the sink's cutout template), and be home on install day to approve the seam locations.
Tips from the trade
- Get the price in writing per square foot and ask what is included: edges, cutouts, backsplash, sealing, tear-out and plumbing. Two quotes with the same total can buy very different jobs.
- Ask where the seams go. Most slabs are 9 to 10.5 ft long. An L or a long run will have a seam, and a good shop puts it away from the sink and out of the line of sight.
- Pick your actual slab for natural stone. Granite, marble and quartzite vary from slab to slab more than any sample shows.
- Check the dishwasher mounting. Stone cannot take screws from below, so the dishwasher needs side-mount brackets.
- Seal natural stone as your fabricator recommends. A few drops of water that darken the surface in minutes mean it is time.
- Use a trivet. Quartz and solid surface can scorch or crack from a hot pan; granite takes heat better, but sudden heat can still crack a seam.
Cutting engineered quartz releases very fine crystalline silica dust, and OSHA lists silica as a serious lung hazard for fabrication workers. That is one more reason to leave quartz cutting to a shop with water-fed saws and dust controls, and not to dry-cut it in your garage.
Common questions
How do I calculate countertop square footage?
Multiply the length of each run by its depth in feet (25.5 inches is 2.125 feet), add the runs together, then subtract one depth times depth square for each corner so it is not counted twice. Add islands as length times width, and a backsplash as its length times its height.
How many square feet of countertop does an average kitchen have?
Most kitchens have about 30 to 40 square feet of countertop. A 10 by 8 foot L-shaped kitchen with a range in one run and a 4-inch backsplash comes to about 34 square feet. An island adds 15 to 30 square feet more.
What is the standard depth of a kitchen countertop?
25.5 inches. Base cabinets are 24 inches deep and the top overhangs the doors by about 1.5 inches. Counters sit about 36 inches off the floor, and islands with seating usually overhang 12 to 15 inches on the seating side.
Is quartz or granite cheaper?
They overlap. Entry-level granite often starts a little below quartz, about $40 versus $50 per square foot installed, while both run to $150 to $200 for premium slabs. In the middle of the market the two usually price within about 10 percent of each other.
How much do new countertops cost for an average kitchen?
About $3,000 on average, with most projects between about $1,400 and $5,250. A 34-square-foot kitchen costs about $1,700 in laminate and about $3,600 in mid-range quartz, including the sink cutout, tear-out of the old tops and reconnecting the sink.
Can I install countertops myself?
Laminate and butcher block are realistic DIY jobs with basic carpentry tools. Granite, quartz, marble and other stone need a fabricator to template, cut and polish the slabs, and the pieces are heavy and easy to crack, so almost everyone has them installed.
Sources and assumptions
Areas are plain geometry. Prices are typical US installed prices checked in October 2026; local prices and slab availability vary a lot, and the installed price per square foot can be edited.
- Installed prices by material, the $3,000 national average, the $1,400 to $5,250 typical range, 30 to 40 sq ft for most kitchens, cutouts ($100 to $200), edge profiles, tear-out ($50 to $300) and plumber rates come from Fixr, cost to replace kitchen countertops (January 2026). The Inch Calculator countertop cost guide gives similar or higher ranges, such as $50 to $200 for quartz and $65 to $135 for concrete.
- Calculator defaults (per sq ft installed): laminate $35, butcher block $70, solid surface $70, granite $85, concrete $85, quartz $90, marble $110, quartzite $120. Fixr reports an $88 average for quartz. The low and high figures in the result are the material's range above.
- Extras: $150 per cutout, $12 per linear foot for a bullnose edge and $22 for an ogee edge, $200 for tear-out and $200 to reconnect the sink. The range gap is a standard 30 inch freestanding range.
- Dimensions: 24 inch base cabinets with a 1.5 inch overhang and a 36 inch counter height are industry-standard sizes. Seating guidance follows the National Kitchen & Bath Association planning guidelines.
- Silica: see OSHA's crystalline silica page for the hazard of cutting engineered stone.