Concrete slab rough cost estimator

Concrete Slab Cost Calculator

Estimate a rough concrete slab total from slab size, thickness, waste, concrete price, base prep allowance, form length, labor rate, and markup. Use it for early owner, builder, and supplier conversations before real quotes.

Units

Slab length (ft)Slab width (ft)Slab thickness (in)Waste / overage (%)Concrete cost per yd³ or m³ ($)Base prep cost per area ($)Form cost per length ($)Labor rate per area ($)Markup / contingency (%)

Estimated slab cost

Material subtotal

Area and volume

Rough cost

Slab cost is not a bid

This is a planning model. Real slab price depends on excavation, subbase, vapor barrier, rebar or mesh, finish, pump or buggy access, labor market, taxes, permits, and supplier quotes.

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Concrete slab cost formula

Area = length × width

Concrete yd³ = area × thickness ft ÷ 27 × (1 + waste %)

Material subtotal = concrete + base prep + forms

Total = (material + labor) × (1 + markup %)

Sample takeoff

A 20 ft by 24 ft slab at 4 in thick with 10% waste is about 6.52 yd³. At $155 per yd³, $1.25 per ft² base prep, $5 per ft forms, and $3.50 per ft² labor, the rough total is about $3,730 before markup.A 6 m by 7.2 m slab at 100 mm thick with 10% waste is about 4.75 m³. With metric unit prices entered, the same model estimates material, labor, and rough total.

Concrete Slab Cost Calculator FAQ

How do I estimate concrete slab cost?+

Estimate slab area and concrete volume, add base prep, forms, labor, waste, and any markup or contingency.Estimate slab area and concrete volume, add base prep, forms, labor, waste, and any markup or contingency.

Does this include rebar or mesh?+

No. Add reinforcement as a separate supplier line, or use the rebar calculator for a material count.No. Add reinforcement as a separate supplier line, or use the rebar calculator for a material count.

Why is this not a bid?+

Access, finish, reinforcement, pump time, demolition, grading, regional labor, tax, and supplier quotes can move the real number.Access, finish, reinforcement, pump time, demolition, grading, regional labor, tax, and supplier quotes can move the real number.