Use this free countertop calculator to estimate kitchen countertop area and rough material cost from run length, depth, backsplash, cutouts, waste, and optional price per square foot.
18 ft run at 25.5 in depth, 10% waste
Quartz, granite, laminate, and solid-surface quotes can change for slab layout, seams, edge profile, overhangs, sink type, backsplashes, templates, fabrication, delivery, and installation rules.
Recent countertop estimates will appear here.
Countertop estimates stay in your browser and use square-foot area math, not a fabricator template.
Inputs and recent answers stay in this browser tab and are not sent to a server.
Estimate countertop square footage for a kitchen or vanity.
Add backsplash area when the backsplash uses the same material.
Subtract known cutout area for rough material planning.
Compare quartz, granite, laminate, or solid-surface rough cost at different material prices.
Plan L-shaped counters by adding matching-depth runs or estimating sections separately.
44.275 ft2 after waste
11.88 ft2 after waste
26.46 ft2 after waste
42.075 ft2 after waste
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Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
Use it when your task matches one of these common needs: Estimate countertop square footage for a kitchen or vanity. Add backsplash area when the backsplash uses the same material. It works best when you already know the measurements, amounts, units, or options the page asks for.
In plain language: The calculator converts depth and backsplash height to feet, multiplies each run by its depth, adds backsplash area, subtracts known cutouts, adds waste, and multiplies by price when entered. The examples on the page are there so you can compare your inputs with a worked example before copying the answer.
Run length: the combined straight countertop runs in feet. Add matching-depth L-shape sections together, or estimate different depths separately. Depth: finished front-to-wall countertop depth in inches, including overhang when it is part of the top. Backsplash: optional backsplash run length and height added to the square footage. Cutouts: sink or cooktop areas subtracted before waste when you know them, while remembering labor charges usually remain.
Read the headline estimate first, then check the material, waste, coverage, and unit lines. For project tools, the supporting lines are often the difference between a rough idea and a list you can actually shop from.
Real quotes can change for slab layout, seams, sink type, cutout labor, edge profile, overhangs, templating, fabrication, install labor, delivery, and supplier minimums. Also check the unit, scale, mode, and result limit because small input changes can change the answer.
Multiply countertop run length by depth after converting depth from inches to feet. Add backsplash area, subtract any known cutout area, then add waste for layout and trimming.
Yes for rough square-foot planning. Quartz, granite, laminate, solid surface, butcher block, and other materials can use the same area math, but each supplier may price slabs, seams, edges, and labor differently.
If both legs have the same depth, add the two straight runs and enter the total length. If one section is deeper, estimate each section separately and add the adjusted square-foot results.
Yes. Measure the island or peninsula as its own run. If it has a different depth than the wall counters, run the calculator once for each depth and add the results.
Include backsplash when the backsplash uses the same countertop material and the supplier prices it by square foot. Enter 0 for backsplash length or height when there is none.
Only subtract them for a rough material area check. Many fabricators still charge for cutout work, templates, and the slab waste around the opening.
Ten percent is a useful early planning number for simple layouts. Complex corners, slab direction, matching patterns, large islands, or supplier slab minimums can make real waste higher.
No. The cost result only multiplies adjusted square feet by the price you enter. Edge profiles, templates, sink cutouts, removal, plumbing, fabrication, delivery, and installation are separate quote items.
Countertops often include edge profiles, seams, corner layouts, backsplash pieces, sink cutouts, delivery, labor, and minimum slab purchase rules.
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.