Hardscaping / Field guide
Concrete Slab Cost Calculator
Estimate a slab, patio, or shed budget using an editable concrete price, waste allowance, and installation rate.
Last updated September 25, 2026. Methodology, sources & assumptions.
Open the Concrete Slab CalculatorLocal project estimator
Concrete slab cost
Turn a slab footprint into a material, labor, and total planning estimate.
Estimate output
Planning onlyEstimated total
$1,003.70
Concrete material plus installation
- Slab area
- 100 sq ft
- Base concrete volume
- 1.23 yd³
- Order volume
- 1.36 yd³
- Material estimate
- $203.70
- Installation estimate
- $800.00
Illustrative assumptions are editable and are not claimed market averages. Confirm supplier pricing, delivery, tax, site access, and the project design before ordering.
01 / The details
Measure the slab and confirm its design
Enter the planned slab length and width in feet and the specified concrete thickness in inches. For an irregular footprint, split the area into rectangles and estimate each section separately. The calculator uses your measurements; it does not decide whether a thickness is suitable for your loads or site.
Use plans, local requirements, and a qualified professional to confirm thickness, reinforcement, base preparation, and joints—especially for garages, driveways, or structural slabs.
- Length and width are entered in feet.
- Thickness is entered in inches.
- Area is length × width; the concrete volume depends on all three dimensions.
02 / The details
Estimate material and installation cost
Base cubic yards = length (ft) × width (ft) × thickness (in) ÷ 324. Multiply the base volume by 1 + the waste percentage ÷ 100 to get the planning order volume.
Estimated concrete material = order volume × your price per cubic yard. Estimated installation = slab area × your labor or installation rate per square foot. Add those two figures for a simple planning total. Set the installation rate to $0 if you are pricing materials only.
The sample rate is only an editable example, not a market average or quote. Concrete delivery, short-load fees, taxes, pumping, excavation, forms, reinforcement, base work, permits, and specialty finishing may need separate line items.
The estimate flow
Measurements become a plan.
03 / The details
Examples with editable planning assumptions
For comparison, these examples use a $150 per cubic yard material price, 10% extra concrete, and an $8 per square foot installation allowance. Those numbers are illustrative inputs only; replace them with supplier and contractor quotes for your area.
A 10 × 10 ft slab at 4 in has about 1.23 base cubic yards and 1.36 cubic yards with 10% extra. At the example rates, material is about $204, installation is $800, and the combined estimate is about $1,004.
A 12 × 20 ft patio at 4 in has about 2.96 base cubic yards and 3.26 cubic yards with 10% extra. The example material estimate is about $489, installation is $1,920, and the combined estimate is about $2,409.
A 20 × 24 ft garage or shed slab at 5 in has about 7.41 base cubic yards and 8.15 cubic yards with 10% extra. At the same illustrative rates, material is about $1,222, installation is $3,840, and the combined estimate is about $5,062. Five inches is only an arithmetic example, not a design recommendation.
04 / The details
Adjust the estimate for your project
A single price per cubic yard may not reflect supplier minimums, delivery distance, load size, or concrete mix requirements. Ask the supplier how the delivered amount is rounded and whether delivery or short-load charges apply.
Labor varies with access, excavation, forms, reinforcement, base condition, pumping, finishing, and local requirements. Compare written scopes rather than treating one per-square-foot rate as a complete bid. The estimate is a planning aid, not a contractor quote.
- Use the specified thickness and verify the slab design.
- Confirm price, delivery, and minimum order details with the ready-mix supplier.
- Add site preparation, materials, and project-specific work that are outside the entered labor rate.
The short version
Estimate base volume from dimensions, add an editable waste allowance, price the order quantity, and include an installation rate that matches your project scope.
Common questions
Concrete slab cost FAQs
How do I estimate the cost of a concrete slab?
Calculate base cubic yards as length in feet × width in feet × thickness in inches ÷ 324. Apply your waste allowance, multiply the resulting yards by your local concrete price, then add installation area × your entered labor rate per square foot.
How much does a 10 × 10 concrete slab cost?
At 4 inches thick, a 10 × 10 ft slab is about 1.23 cubic yards before allowance. With the page’s illustrative assumptions of $150 per cubic yard, 10% extra, and $8 per square foot for installation, the combined estimate is about $1,004. Replace those example rates with local quotes.
Does this concrete slab estimate include labor?
Yes, if you enter an installation rate per square foot. That line is area × rate and should reflect the work included in your project. Enter $0 for a materials-only estimate, and add any excluded site work separately.
What does the concrete slab cost estimate leave out?
The simple estimate includes concrete material based on price per cubic yard and an optional area-based installation amount. It does not automatically include delivery, short-load charges, tax, excavation, pumping, forms, reinforcement, base preparation, permits, or specialty finishing.
Are the example concrete prices current local rates?
No. The displayed sample material and installation rates are illustrative inputs to show the calculation, not live market prices, a national average, or a contractor quote. Edit both rates or use quotes for your location.
Does this calculator tell me how thick my slab should be?
No. It calculates volume and cost from the thickness you enter. Loads, soil, drainage, reinforcement, climate, and local rules affect slab design; verify the required thickness and details for your project.
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