Countertop Calculator

Measure the sections, then price the work line by line

Countertops are measured in inches, priced in square feet, and finished in linear feet, and a good estimate keeps all three honest. Enter each counter section’s length and depth and this page works out the square footage, then prices the job in lines: material and fabrication per square foot, installation per square foot, finished edges per linear foot, backsplash by its own area, cutouts and seams per piece, removal of the old counters, and template and other fees flat. Every rate is yours to enter from quotes, because stone, quartz and laminate prices and fabrication charges are local and material-specific. The estimate applies any minimum charge openly, adds contingency once and tax once, and reports the total, a range, and the all-in cost per square foot, with a downloadable estimate.

Counter sections (inches)

Standard counter depth is about 25.5 inches with the overhang. Measure each run, island and return as its own section. Cutout areas are not deducted, matching usual fabrication practice: the cut is charged as work instead, below.

Material, fabrication and installation

If your per-square-foot quote is a single installed price, put it in the material and fabrication field and leave installation at zero: never both at full price.
Slab sizes and how much of each slab is usable vary by material and layout; if your fabricator quoted a slab size, enter the usable figure and the results show how many slabs the job needs.

Edges, backsplash, cutouts and seams

Fees and fixed charges

Minimum, contingency, tax and range

Applied once, on the subtotal (or the minimum-charge base) plus contingency. How counters are taxed varies by state and by how the contract is written; enter the basis your quote uses.

Disclaimer: This calculator gives estimates for general information only. It is not financial, medical or other professional advice. Final countertop pricing depends on templating on site and the material actually selected; the binding figure is the fabricator’s written quote.

What this calculator does

It turns a tape-measure survey into an itemized countertop estimate. Sections in inches become square feet; the square footage is priced at your material and fabrication rate and your installation rate; the finishing work that per-square-foot prices habitually blur (edge profiles by the linear foot, backsplash by its own area, each cutout and seam as a piece of work) is itemized at your rates; removal, templating and delivery sit as their own charges. An optional slab figure converts the area into a slab count, which is how the material is actually bought and where layout waste hides. The bookkeeping is the strict estimator pattern used across this site: lines rounded to cents, minimum charge applied openly, contingency once, tax once, your range around the total, and an all-in cost per square foot for comparing quotes that package the same job differently.

How to use it

  • Measure in inches, including the overhang. Counter depth is usually about 25.5 inches on standard cabinets (24 inch cabinets plus overhang), and islands and peninsulas are deeper. Measure each run separately, corners counted once: double-measuring a corner is the most common home measurement error and it inflates every per-square-foot line at once.
  • Cutouts are charged, not deducted. Fabricators generally bill the full counter area and charge for each sink or cooktop cutout as work, because the waste piece has no value and the cutting has risk. This page follows that practice and says so; if a quote deducts cutouts instead, it will look cheaper on area and should show no cutout fees, and the two are only comparable once that is spotted.
  • Edges are priced by the foot, and profiles differ. A simple eased edge may ride inside the square-foot rate while bevels, ogees and mitred build-ups are charged per linear foot. Count only the edges that will actually be finished and visible (wall edges are not), and make sure the rate you enter matches the profile you chose.
  • The slab count is a reality check, not a price. Material is bought by the slab while you are billed by the square foot, and layout (long runs, seam placement, pattern matching) decides how much of each slab is usable. A job whose area barely exceeds a whole number of slabs is worth a layout conversation with the fabricator before the material is chosen, which the slab row in the results is designed to start.
  • One installed rate or two rates, never both. Quotes come as a single installed per-square-foot price or as material-plus-fabrication with installation separate. Put a single installed price in the first rate field and zero in the second; entering the full installed price in both fields is the double count this page’s hint warns about on the form itself.

How it is calculated

  • Section area = length (in) x depth (in) / 144, in square feet. Counter area = the sum of the section areas.
  • Material and fabrication = counter area x its rate. Installation = counter area x its rate. Removal = counter area x its rate, when a removal rate is entered.
  • Edges = finished length (ft) x rate per foot. Backsplash area = length (ft) x height (in) / 12; backsplash = that area x its rate. Cutouts and seams = count x charge each.
  • Slabs required (when a usable slab area is entered) = the counter area divided by the usable area per slab, rounded up to the next whole slab.
  • Subtotal = the sum of the line amounts. Minimum charge: if a minimum is entered and exceeds the subtotal, the minimum becomes the base and the results state that the minimum charge applied. Contingency applies once to the base; tax once to base plus contingency. Total = base + contingency + tax. Range = total less and plus your percentage. Per square foot = total / counter area.

Worked examples

A kitchen, fully priced. Illustrative rates: a main run of 120 by 25.5 inches (21.25 square feet) and an island of 72 by 36 inches (18.00 square feet) give a counter area of 39.25 square feet. Material and fabrication at $85 per square foot is $3,336.25; installation at $18 is $706.50; 22 linear feet of finished edge at $12 is $264.00; a backsplash 12 feet long and 4 inches high (4 square feet) at $45 is $180.00; 2 cutouts at $75 are $150.00; 1 seam at $100; removal of the old counters at $8 per square foot is $314.00; template fee $150. Subtotal $5,200.75. Contingency at 5% adds $260.04 for a total of $5,460.79, or $139.13 per square foot all-in, ranging from $4,914.71 to $6,006.87 at plus or minus 10%. At 30 usable square feet per slab, the job needs 2 slabs.

The per-square-foot quote, decoded. The example’s all-in $139.13 per square foot began as an $85 material rate: edges, backsplash, cutouts, seams, removal, fees and contingency account for the rest. A competing quote at $120 per square foot “all-in” is not necessarily dearer or cheaper than one at $85 plus extras; it is packaged differently, and itemizing both on the same lines is the only honest way to compare them.

A vanity top meets the floor. One small section, 48 by 25.5 inches, is 8.50 square feet; at $85 the material line is $722.50. Against a fabricator’s $1,200 minimum the estimate builds on the minimum, adds 5% contingency ($60.00) and totals $1,260.00, stating that the minimum charge applied. Small tops are priced by minimums and trip charges, not by the square foot.

Reading your results

Read the slab count first if you entered slab sizes: a job at 2.1 slabs pays for 3, and changing a seam location or a run length by inches can sometimes pull it back to 2, which is real money decided by geometry. Then read the share of the total sitting outside the material rate (edges, backsplash, cutouts, seams, removal, fees): on the worked example it is over a third of the subtotal, which is why per-square-foot comparisons mislead. Finally, treat the templated measurement as the moment estimates become prices: your tape figures start the conversation, the fabricator’s template ends it, and small differences between the two are normal rather than suspicious.

Limitations

  • Layout waste is approximated by the slab count. Vein matching, pattern direction, seam placement and slab defects can make a layout use materially more than the area arithmetic suggests. The slab figure is a planning check, and the fabricator’s layout is the authority.
  • Material grades move the rate more than the area does. Within one material family, grade, thickness (2 cm versus 3 cm), finish and rarity swing the per-square-foot rate widely. The page carries your rate for the exact selection; it offers no grades of its own, deliberately.
  • Structural and plumbing knock-ons are excluded. Sink and faucet purchases, plumbing reconnection, cabinet reinforcement for heavy stone and electrical moves are real project costs that live in other budgets or in the fixed charges field when quoted.
  • Tax treatment varies. Whether counters are taxed as materials, as a capital improvement, or split, depends on the state and the contract form. The tax field applies the basis you enter, once, and the quote you sign should state its own basis in words.

Frequently asked questions

How do I calculate countertop square footage?

Measure each section’s length and depth in inches, multiply them, divide by 144, and add the sections. A 120 by 25.5 inch run is 3,060 square inches, which is 21.25 square feet. Count corners once, include the overhang in the depth, and measure islands and returns as their own sections. This page performs the conversion per section and totals it, then prices the lines that hang off that area.

Are sink cutouts deducted from the square footage?

Usually not. Standard fabrication practice bills the full counter area (the material was cut from a slab either way) and charges each cutout as a piece of work, which is how this page treats it. Some fabricators price differently, so when comparing quotes, check whether a lower area has been paired with cutout charges or a full area with none; mismatched pairings are where apparent bargains hide.

How many slabs will my countertop need?

Divide the counter area by the usable area per slab for your material and layout, and round up. Slabs vary in size by material, and the usable share falls with long runs, matched patterns and seam placement. Enter the usable figure your fabricator works to and the results give the count; a result just over a whole number of slabs is worth a layout discussion, since small changes can sometimes save an entire slab.

Why is installation sometimes separate and sometimes included?

Because the trade sells both ways: some quotes are a single installed price per square foot, others separate material and fabrication from delivery and installation. Neither is wrong, but they cannot be compared as raw numbers. This page carries both rate fields so either quote can be entered faithfully, with the warning that a single installed price belongs in the first field alone.

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Method: section areas from dimensions in inches; itemized quantity times rate lines at user-entered rates; minimum charge applied to the base, contingency once and tax once, exactly as defined on this page. Last reviewed: 13 October 2026.