Countertop Square Footage Calculator
Countertop area and slab count for a kitchen.
Reviewed by the Calculation Machine team · How we check our maths
Your values
ⓘ Live results
Results
- Countertop area
- 36 sq ft
- Area with waste/seams
- 43.2 sq ft
- Slabs needed
- 1
Quick answer
Countertop area is the sum of each run's length times depth including overhang, plus waste for seams and cuts.
The formula
area = sum(length x (depth + overhang)) x (1+waste%)
Worked example
Worked example
Using the values the calculator loads with.
Inputs
- Run 1 length10 ft
- Run 2 length6 ft
- Counter depth25.5 in
- Front overhang1.5 in
- Waste/seam allowance20 %
- Slab usable area45 sq ft
Result
- Countertop area36 sq ft
- Area with waste/seams43.2 sq ft
- Slabs needed1
How to use the Countertop Square Footage Calculator
- 1Add up the length of each counter run.
- 2Enter cabinet depth plus front overhang for the total counter depth.
- 3Add 15-25% waste for natural stone seams, veining match and cutouts.
Frequently asked questions
Why is stone waste so high?
Slabs are irregular, sinks and cooktops cut out material, and pattern matching wastes more of the slab.
Laminate vs stone waste?
Laminate sheet goods generally need far less waste allowance than natural stone slabs.
About this calculator
- Built and reviewed by the Calculation Machine team · How we build and test calculators
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