Concrete Volume Calculator
Calculate concrete needed for any construction project instantly
Dimensions
Tip: 4" = 0.33 ft, 6" = 0.5 ft, 8" = 0.67 ft
Typical range: $125-$200 per yard
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Quick Examples
How to Calculate Concrete Volume
Calculating the right amount of concrete is crucial for any construction project. Ordering too little means delays and additional delivery charges, while ordering too much wastes money and materials. Our concrete calculator helps you determine the exact amount needed for various shapes and structures.
The basic formula for calculating concrete volume depends on the shape of your project. For rectangular slabs and footings, multiply length × width × thickness. For cylindrical structures like piers, use the formula πr²h (pi times radius squared times height). Always measure in consistent units and convert thickness from inches to feet when working in imperial units.
Common Concrete Projects
Concrete Slabs & Patios
Typical thickness: 4 inches (0.33 ft) for patios, 6 inches (0.5 ft) for driveways
Footings & Foundations
Foundation footings typically measure 2 feet wide by 1 foot deep for single-story structures
Concrete Piers & Columns
Round piers for deck footings typically range from 10-12 inches in diameter
Concrete Stairs
Standard rise: 7-8 inches, standard tread depth: 10-11 inches
Understanding Concrete Measurements
Cubic Yards
Concrete is typically ordered by the cubic yard. One cubic yard equals 27 cubic feet (3 ft × 3 ft × 3 ft). This is the standard unit used by ready-mix concrete suppliers.
Concrete Bags
An 80-pound bag of concrete mix yields approximately 0.6 cubic feet when mixed. For small projects, bagged concrete may be more economical than ordering ready-mix with minimum delivery charges.
Waste Factor
Always order 5-10% more concrete than calculated to account for spillage, uneven subgrade, and over-excavation. It's better to have a small amount left over than to run short during the pour.
Frequently Asked Questions
How do I convert inches to feet for concrete calculations?
Divide the number of inches by 12. For example, 4 inches = 4÷12 = 0.33 feet, 6 inches = 0.5 feet, and 8 inches = 0.67 feet. Always use decimal feet when calculating concrete volume.
How much does a cubic yard of concrete cost?
The cost of ready-mix concrete typically ranges from $125 to $200 per cubic yard, depending on your location, concrete strength (PSI), and any additives. Prices may be higher for small loads or remote delivery locations.
Should I use ready-mix or bagged concrete?
For projects requiring more than 1 cubic yard (about 45 bags), ready-mix concrete is more economical and easier. For small repairs or projects under 1 cubic yard, bagged concrete is often more practical despite the higher per-yard cost.
How thick should my concrete slab be?
Standard residential slabs: walkways 4 inches, patios 4 inches, driveways 6 inches, garage floors 6 inches. Commercial and heavy-load applications may require 8 inches or more. Always consult local building codes.
Is this calculator accurate for all concrete types?
Yes, this calculator works for all concrete types (standard, high-strength, fiber-reinforced, etc.) as it calculates volume only. The concrete type affects strength and cost, but not the volume needed for your project.