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Concrete Patio Calculator — Materials, Base & Cost
Estimate concrete volume, base gravel, and control joint spacing for outdoor living spaces.
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CONSTRUCTION & CODE
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Project Specifications
Patio Volume & Joint Formula
Transparent mathematical methodology explained in plain English.
Volume = (L × W × Depth) / 27 | Joint Interval = 2.5 × Thickness Patios require adequate slope (1/8" per foot) away from the house foundation, with expansion joints cut at intervals 24 to 30 times the slab thickness.
Variables Explained:
- Slope: Ensure 1/8" to 1/4" pitch per foot away from the house structure.
Real Project Example
14 ft × 18 ft Patio (4 in depth)
Outdoor patio pour calculations.
Sample Project Inputs:
Length: 18 ft
Width: 14 ft
Depth: 4 in
Waste: 10%
Step-by-Step Calculation:
- Area: 18 × 14 = 252 sq ft.
- Net volume: 252 × (4/12) = 84 cu ft = 3.11 cu yd.
- With 10% waste: 3.42 cubic yards.
- Control joints: Cut every 8 to 10 feet in both directions.
Calculated Answer: Order 3.5 cubic yards ready-mix concrete.
Knowledge Base
Frequently Asked Questions: Concrete Patio Calculator
Click any question below to expand quick answers, formulas, and expert tips.
Should a concrete patio slope away from the house?
Yes. Maintain a minimum downward slope of 1/8 to 1/4 inch per foot away from your foundation to prevent water pooling against the siding or sill plate.