Countertop area estimator

Countertop Square Footage Calculator

Convert countertop dimensions in inches into square feet for early material planning. Add a simple backsplash and allowance for fabrication loss.

No signupInstant resultUS + metric

How it works

Calculate your material requirement

Estimate countertop and backsplash square footage from section length, depth, quantity, and a material allowance.

Countertop area = length in feet × depth in feet × quantity. Backsplash area is added, then the selected fabrication allowance is applied.

A 10 ft run at 25.5 in deep plus a 10 ft × 4 in backsplash contains about 24.6 ft² before adding fabrication allowance.

Fabricators price slabs, seams, edges, sink cutouts, and installation differently.
Record each section separately when lengths or depths differ.
Standard slab yield varies with slab dimensions, defects, pattern direction, and layout.

Common questions

How do I measure an L-shaped countertop?

Measure each rectangular leg as a separate section and add the areas. Avoid double-counting the inside corner.

Does the slab estimate guarantee the number of slabs?

No. It is only a 50 ft² equivalent. A fabricator must lay out pieces on actual slab dimensions.

Are cutouts subtracted?

Sink and cooktop cutouts are usually not subtracted for material purchasing because the surrounding slab is still required.