Concrete Surface Area Calculator
Estimate top, bottom and edge surface area for rectangular concrete slabs or pads, then calculate coating coverage, container count and material cost.
Default project preview
287.5 ft²
Top surface area
240 ft²
Included bottom area
0 ft²
Included edge area
21.3 ft²
Base exposed area
261.3 ft²
Calculator
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Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Top area = length × width × slab count. Edge area = perimeter × thickness × slab count. Selected faces are added, then multiplied by the coverage allowance. Containers are rounded up.
FAQ
Concrete Surface Area Calculator questions
When should the bottom face be included?+
Include it for precast pieces or slabs coated before installation. Most slabs placed on grade do not have an accessible bottom face.
Why include concrete edges?+
Exposed slab edges, steps and freestanding pads add coating area beyond the top surface.
Does this calculate concrete volume?+
No. It estimates exposed surface area for coatings, sealers or finishes. Use a concrete-volume calculator for the pour quantity.