Countertop Square Footage Calculator
Enter each countertop section, the backsplash height and any sink cut-outs and get the gross and net square footage and the cost at a price per square foot.
Countertop sections — split an L or U into rectangles so corners are counted once
Cut-outs to subtract for a net area (sink, cooktop)
Measure to the finished edge, including any overhang. The result updates as you type.
Countertop area
54.33 ft²
49 ft² counters + 5.33 ft² backsplash · 49.29 ft² net of cut-outs
| Section 1 | 21.25 ft² |
| Section 2 | 12.75 ft² |
| Section 3 | 15 ft² |
| Backsplash | 5.33 ft² |
| Cut-outs | − 5.04 ft² |
| Gross (priced area) | 54.33 ft² (5.05 m²) |
What this page cannot tell you
How many slabs your job needs. Fabricators lay pieces out on real slab sizes and seams, so the slab area you pay for can be more than the counter area. Pricing rules for cut-outs, edges and backsplash differ by shop.
How to measure countertop square footage
- Split the counter into rectangles. An L or U shape is two or three rectangles; measure so the corner is counted only once.
- Measure length and depth. In inches, to the finished edge including overhang.
- Mark backsplash sections. And enter the backsplash height.
- Add cut-outs if you want a net figure. Sink and cooktop openings.
- Read the area and cost. Gross area is what's usually priced; net area is also shown.
10 situations where a countertop calculator helps
Getting granite or quartz quotes
Shops price per square foot; know your number before you call.
Kitchen islands
Enter the island as its own section with its real depth.
Comparing materials
Change the price per square foot to compare laminate, quartz and granite.
Backsplash in the same stone
Include a 4 in or full-height backsplash in the area.
Bathroom vanities
Small tops priced per square foot, often from remnants.
Checking a fabricator's quote
Compare their area with your measurement.
Butcher block and concrete
Area for ordering slabs or estimating sealer.
L-shaped kitchens
Break the L into two rectangles so the corner isn't doubled.
Remodel budgets
Countertops are a big line item; the cost line gives a figure.
Outdoor kitchens
The same arithmetic for an outdoor counter.
How the area is worked out
This is arithmetic with no outside data: each section is length × depth in inches ÷ 144 = square feet. Backsplash area is the length of the sections you mark × the backsplash height ÷ 144. Cut-outs are subtracted only from the net figure.
The cost uses the gross area (counters plus backsplash) because fabricators usually charge for the stone used; cut-outs often carry their own charge instead of a credit.
Limits: the page does not lay out slabs. Fabricators fit pieces onto real slab sizes and decide where seams go, so the slab area you pay for can be larger than the counter area. Edge profiles, cut-out fees and installation are priced differently by every shop. Everything runs in your browser.
Frequently asked questions
How do I calculate countertop square footage?
Multiply length by depth in inches and divide by 144 for each rectangle, then add them up.
How do I measure an L-shaped countertop?
Measure one leg full length to the wall, and the other leg from the edge of the first leg, so the corner is counted once.
Should I include the backsplash?
If it's the same material, yes — tick the sections with backsplash and enter its height.
Do I subtract the sink cut-out?
For pricing, usually not: shops price the stone used. The page shows both gross and net.
What's a standard countertop depth?
Measure yours; the page uses whatever depth you enter.
How many slabs do I need?
That depends on slab size and seam layout, which only the fabricator can plan.
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