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Countertop Calculator
Use this free countertop calculator to price a new kitchen or bathroom counter before you call a fabricator. Enter the length and depth, pick a straight, L-shaped, or U-shaped layout, and choose a material, and the calculator works out the square footage and an estimated cost range. It adds the waste allowance, the backsplash, and the edge profile, so the number you see is close to a real quote rather than just the slab price.
| Item | Amount |
|---|---|
| Countertop area | 20.83 sq ft |
| Material (with waste) | $1,375 – $3,438 |
| Backsplash (3.33 sq ft) | $200 – $500 |
| Edge (10 ft) | $0 |
| Estimated total | $1,575 – $3,938 |
How it works
The calculator starts with the area. For a straight run, the area in square feet is the length in feet times the depth in inches, divided by 12. A 10-foot run that is 25 inches deep is 10 × 25 ÷ 12 = 20.83 square feet. For an L-shape, it adds the two runs together and subtracts the corner square once, because the corner is counted in both runs. For a U-shape, it adds three runs and subtracts two corner squares. The depth is the same for every run, which matches how most kitchens are built, with 25 inches the standard depth for kitchen counters and 22 inches common for bathroom vanities.
Next it adds the waste allowance. Countertop slabs come in fixed sizes, and the pieces are cut from them, so offcuts and the corners cut out for sinks and cooktops cannot be reused. Ten percent is the standard allowance for a straight run, and 15 percent is sensible for L-shaped and U-shaped kitchens, where the corners create more unusable offcuts. The waste is applied to the material quantity, so a 20.83 square foot countertop with a 10 percent allowance is priced as 22.92 square feet.
Material prices are typical installed ranges, and they vary by region, supplier, brand, and color. Laminate is the budget option at about $15–$40 per square foot installed. Butcher block runs about $40–$100, solid surface about $50–$100, quartz about $60–$150, granite about $50–$200, marble about $75–$250, and concrete about $65–$135. These are estimates for planning, not quotes: a rare granite color or a premium quartz brand can sit above its range, and a simple laminate job can come in below it. Always get at least two local quotes before committing, and confirm whether the quote includes templating, delivery, installation, and sink cutouts.
The backsplash is priced in the same material as the countertop. Its area is the total countertop front length times the backsplash height, divided by 12. A 10-foot run with a 4-inch backsplash is 10 × 4 ÷ 12 = 3.33 square feet, which in quartz at $60–$150 per square foot adds about $200–$500. A full-height backsplash that runs from the counter to the upper cabinets, typically 18 inches, costs far more, and many homeowners switch to tile for that stretch instead of matching stone.
The edge profile is charged per linear foot of exposed front edge. An eased edge, which is just a slightly softened square corner, is usually included free. A bevel adds about $10 per linear foot, a bullnose about $15, and an ogee, the classic S-shaped profile, about $25. The calculator applies the edge cost to the front length of the countertop: the run length for a straight counter, and the sum of the run lengths for L- and U-shapes. Fancy edges look beautiful on thick stone, but on a tight budget the eased edge is the sensible default.
One cost the calculator does not include is demolition and disposal of the old countertop, which typically runs $200–$500, and plumbing work to disconnect and reconnect the sink and faucet. Budget for those separately, and ask the fabricator whether the quote includes sealing for natural stone, which granite and marble need every year or two, while quartz and solid surface never need sealing at all.
Total = material sq ft × price range + backsplash sq ft × price range + edge ft × edge cost
Worked example
You are replacing a straight 10-foot kitchen countertop that is 25 inches deep, in quartz at $60–$150 per square foot installed, with a 4-inch backsplash, an eased edge, and a 10 percent waste allowance.
Step 1: Area — 10 × 25 ÷ 12 = 20.83 square feet.
Step 2: Material quantity — 20.83 × 1.10 = 22.92 square feet with waste.
Step 3: Material cost — 22.92 × $60 = $1,375, and 22.92 × $150 = $3,438 (rounded to $3,438).
Step 4: Backsplash — 10 × 4 ÷ 12 = 3.33 square feet, costing 3.33 × $60 = $200 to 3.33 × $150 = $500.
Step 5: Edge — the eased edge costs $0 per foot, so $0.
Step 6: Total — $1,375 + $200 = $1,575 at the low end, and $3,438 + $500 = $3,938 at the high end.
The estimated total is $1,575–$3,938. If you switch to granite at $50–$200 per square foot, the same countertop costs $1,313–$5,250 with the backsplash included.
FAQ
How do I measure for a countertop?
Measure the length of each run along the wall in feet, and the depth from the wall to the front edge in inches, usually 25 inches. For an L-shape, measure both runs and subtract the corner overlap once. Measure twice, and note the position of the sink, cooktop, and any outlets, because the fabricator needs those cutout locations too.
How much does a quartz countertop cost per square foot?
Quartz typically costs 60 to 150 dollars per square foot installed, depending on the brand, color, thickness, and edge profile. A 10-foot by 25-inch countertop is about 20.8 square feet, so the material and installation usually run about 1,375 to 3,438 dollars before backsplash and edge upgrades, with a 10 percent waste allowance.
Is quartz or granite cheaper?
Granite typically costs 50 to 200 dollars per square foot installed, and quartz typically costs 60 to 150 dollars per square foot, so their ranges overlap heavily and either can be cheaper depending on the exact stone or brand. Granite is a natural stone that needs periodic sealing, while quartz is engineered, does not need sealing, and is more consistent in color.
Why is waste added to a countertop estimate?
Countertop slabs come in fixed sizes, and the pieces are cut from them, so offcuts and the corners cut out for sinks and cooktops cannot be reused. A 10 percent waste allowance is standard for a straight run, and L-shaped and U-shaped kitchens need 10 to 15 percent because the corners create more unusable offcuts.
How much does a backsplash add to the cost?
A backsplash adds the cost of the same material for the wall area, which is the countertop length times the backsplash height. A 10-foot run with a 4-inch backsplash is about 3.3 square feet, so in quartz at 60 to 150 dollars per square foot that adds about 200 to 500 dollars. A full-height backsplash to the cabinets costs considerably more.