ProjectFigure Exact material estimates for every home & DIY project.

Countertop Calculator

A countertop calculator works out the surface area of your counters in square feet — how stone, laminate and solid surface are priced — plus the front-edge length and any backsplash. Enter the run length and depth and it sizes the job for quotes or a DIY material order.

Your measurements

Result

Countertops are quoted by the square foot installed, but the edge profile, backsplash, sink cut-outs and seams add to it. This gives you the area and edge to start from, and the product links cover DIY butcher block and laminate.

How it is calculated

Area = length × depth ÷ 144 (square feet). Front-edge length = run length. Backsplash = length × backsplash height. Stone is priced per square foot installed with a slab minimum and extras for edge profiles, cut-outs and seams — so this is the base figure, not the full quote.

Steps

Enter the total counter length (add up all runs).
Enter the depth (about 25 in with overhang).
Choose whether to include a backsplash and its height.
Read the square footage and edge length.
For an L-shape, add runs and subtract the corner overlap.

Worked example

A 120 in run at 25 in deep is about 20.8 sq ft, with 10 ft of front edge and ~3.3 sq ft of 4 in backsplash.

Common questions

How do I calculate countertop square footage?

Length × depth ÷ 144. A 10 ft run at 25 in deep is about 20.8 sq ft. Add each run for an L- or U-shape.

What depth are countertops?

About 25-26 in including the overhang (cabinets are 24 in). Bar and island depths vary.

Why is stone priced with a minimum?

Slabs come in fixed sizes, so fabricators charge a slab minimum plus edge, cut-out and seam work — your area is the starting point for the quote.

Should I include the backsplash?

If you want matching material up the wall, yes — the calculator adds it as extra area at the height you set.