BYTETOOLS

Countertop Calculator

Add up countertop square footage from straight, L and U runs plus islands, subtract sink and cooktop cut-outs, add backsplash, and cost material, edge and seams.

Countertop sections

Break an L or U shape into straight segments so the corner is only counted once. Standard base-cabinet depth with a 1 in overhang is 25.5 in; an island with seating is usually 36–42 in.

Columns: name, length (ft), depth (in), finished edge (ft).

Cut-outs

Columns: name, width (in), depth (in), quantity.

57.33
Gross deck area (sq ft)
9.42
Cut-out area (sq ft)
5.33
Backsplash area (sq ft)
53.25
Net area (sq ft)
58.58
Order with waste (sq ft)
30.00
Finished edge (ft)
$95.03
Effective price per sq ft

Cost breakdown

LineBasisCostShare
Material58.58 sq ft$2,635.8852.1%
Fabrication and install58.58 sq ft$1,464.3828.9%
Edge (Eased / square)30.00 ft$360.007.1%
Cut-outs2 openings$300.005.9%
Seams2 seams$300.005.9%
Total$5,060.25100%

Area = Σ(segment length × depth), less cut-outs if you tick the box, plus backsplash run × height. Many fabricators quote the full rectangle and charge a flat fee per cut-out instead of deducting the hole, which is why the deduction is optional here and cut-outs are also priced separately. Slab yields depend on the actual stone size, so a fabricator's template will nearly always beat this take-off. Estimates only.

What is the Countertop Calculator?

The ByteTools Countertop Calculator takes a real kitchen apart into the pieces a fabricator quotes. Enter each straight run, return leg and island as a length and a depth, add the backsplash as a run and a height, and list the sink and cooktop openings — the calculator sums the deck area, deducts the cut-outs if you want it to, and applies a waste and seam allowance.

  • Unlimited sections for straight runs, L and U shapes and islands
  • Sink and cooktop cut-outs with an optional deduction toggle
  • Backsplash area from linear feet and height, standard or full height
  • Finished-edge linear footage priced separately by profile
  • Cost breakdown by line with percentage share and effective price per square foot
  • CSV export of the whole take-off; everything computed locally in your browser

How to use the Countertop Calculator

  1. 1

    Choose imperial or metric units and your currency, then pick the edge profile you want priced.

  2. 2

    Add one row per countertop section with its length, depth and how many linear feet of that run get a finished edge — break an L or U into segments so the corner is counted once.

  3. 3

    List the sink, cooktop and any other openings with their width, depth and quantity, and tick or untick whether cut-outs are deducted from the slab.

  4. 4

    Enter the backsplash run and height, your waste allowance and the number of seams.

  5. 5

    Fill in material, fabrication, edge, cut-out and seam prices to see the breakdown table, and copy the take-off as CSV.

About the Countertop Calculator

The ByteTools Countertop Calculator takes a real kitchen apart into the pieces a fabricator quotes. Enter each straight run, return leg and island as a length and a depth, add the backsplash as a run and a height, and list the sink and cooktop openings — the calculator sums the deck area, deducts the cut-outs if you want it to, and applies a waste and seam allowance.

The cost side is broken out the way a real quote is: material per square foot, fabrication and installation per square foot, finished edge per linear foot, a flat fee per cut-out and a fee per seam. A breakdown table shows what share each line is of the total, plus the effective price per square foot once everything is added up.

All the maths happens in your browser — no measurements are uploaded and no quote request is generated. It is a planning estimate: a fabricator templating your cabinets will always beat a take-off, and slab yields depend on the actual stone in the yard.

Frequently asked questions

How do I measure countertop square footage?

Multiply each straight run's length by its depth and add them up, breaking L and U shapes into segments so the corner is not counted twice. Standard base cabinets with a one-inch overhang give a depth of 25.5 inches; an island with seating is usually 36 to 42 inches deep.

Do fabricators deduct sink cut-outs from countertop square footage?

Most do not. They quote the full rectangle of stone and then charge a flat fee per cut-out, because the offcut is unusable and the hole takes labour. That is why the deduction here is a checkbox and cut-outs are also priced separately.

How much waste should I allow on a stone countertop?

Ten percent covers a plain slab. Push it to fifteen or twenty percent for a heavily veined or book-matched stone where pieces have to be cut in a particular orientation, or where several small returns come out of one slab.

What is a countertop seam and why does it cost extra?

A seam is where two pieces of slab are joined, usually because a run is longer than a slab or will not fit through a doorway. It costs extra because the edges are polished, the joint is colour-matched and epoxied, and the two pieces must be levelled perfectly.

How much backsplash do I need for my kitchen?

Multiply the run of wall behind the counter by the backsplash height. A standard stone backsplash is 4 inches or about 100 mm tall; a full-height splash to the wall cabinets is typically 18 inches, which uses roughly four and a half times as much material.

Is this the same as what a countertop installer will quote?

It is a close planning estimate, not a quote. An installer templates the actual cabinets, nests the pieces on the real slab and knows the local labour rate, all of which move the number. Use this to sanity-check a quote or to compare materials before you call anyone.

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