Free Concrete Calculator - Calculate Cubic Yards Needed
Calculate exactly how much concrete you need. Best free concrete calculator 2025 - slabs, footings, posts, and more.
Quick Answer
Concrete volume in cubic yards: (Length × Width × Depth in feet) / 27. A 10ft × 12ft slab that is 4 inches (0.33 ft) deep: (10 × 12 × 0.33) / 27 = 1.47 cubic yards. Add 10% for waste. Concrete costs $100-150 per cubic yard. Calculate at practicalwebtools.com.
Key Facts about Concrete Calculator:
- Formula: (L × W × D in feet) / 27 = cubic yards
- 1 cubic yard = 27 cubic feet
- Standard slab thickness: 4 inches (driveways: 5-6 inches)
- Concrete costs $100-150 per cubic yard delivered
- Add 10% for waste and uneven surfaces
- Cures to full strength in 28 days
- Minimum order often 1 cubic yard
Why Use Our Concrete Calculator?
Calculate concrete needs:
Cubic Yards
Calculate exactly how much needed.
Multiple Shapes
Slabs, footings, columns, stairs.
Cost Estimate
Approximate project cost.
Waste Factor
Add 10% for good measure.
Instant Results
Get estimate immediately.
100% Private
Your project stays private.
How to Concrete Calculator in 3 Easy Steps
Calculate concrete:
Choose Shape
Slab, footing, column, etc.
Enter Dimensions
Length, width, depth/height.
Get Volume
See cubic yards and cost estimate.
Order the Right Amount
Avoid ordering too little or too much
Cost estimation included
Handles different shapes
Includes waste factor
Common Use Cases for Concrete Calculator
Essential for:
Frequently Asked Questions
Everything you need to know about our concrete calculator
How do I calculate concrete needed?
(L × W × D in feet) / 27 = cubic yards.
Multiply length × width × depth (all in feet), then divide by 27 to get cubic yards. A 10×10×0.33 ft slab = 33 cubic feet = 1.22 cubic yards.
How thick should a concrete slab be?
Patios: 4", driveways: 5-6", garages: 6"+.
Patios: 4 inches. Driveways: 5-6 inches. Garage floors: 6 inches minimum. Heavy equipment: 8+ inches.
How much does concrete cost?
$100-150/cubic yard delivered; $5-7 per bag for small projects.
Ready-mix concrete: $100-150 per cubic yard delivered. Bags for small projects: $5-7 per 60-80 lb bag (each makes about 0.5 cubic feet).
How much extra should I order?
Add 10% for waste and uneven surfaces.
Order 10% more than calculated to account for waste, uneven surfaces, and unexpected needs. Running short during a pour is worse than having extra.
Still have questions? Try the tool yourself!
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