Concrete Calculator
Calculate how much concrete you need in cubic yards, cubic feet, and cubic meters — free and instant.
Concrete Calculators for Every Project
Choose the right calculator for your specific project type.
Concrete Slab Calculator
Calculate exactly how much concrete you need for a patio, driveway, garage floor, or sidewalk slab.
Calculate slabConcrete Cost Calculator
Estimate your total concrete project cost including materials, delivery, and labor.
Calculate costConcrete Footing Calculator
Calculate concrete volume for rectangular or cylindrical footings. Supports multiple footings.
Calculate footingConcrete Bags Calculator
Find out how many 40, 50, 60, or 80 lb bags you need. Compare sizes and plan your purchase.
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Volume in cubic yards, feet, and meters
How to Calculate Concrete
Multiply your project's length and width in feet, then multiply by the depth converted from inches to feet (divide inches by 12). Divide the result by 27 to convert cubic feet to cubic yards. This gives you the volume of concrete needed for a rectangular area.
How to Measure Your Project
Measure the longest side (length) and shortest side (width) in feet. For depth, measure in inches — most slabs are 4 to 6 inches thick. Measure in at least three spots and use the largest measurement. For irregular or L-shaped areas, break the project into separate rectangles, calculate each one individually, and add them together.
How Much Extra Concrete Should You Order?
The industry standard is to order 10% more concrete than your calculated volume. Uneven subgrade, form leaks, spillage, and slight measurement variations consume more concrete than expected. Running short during a pour is far more expensive than having a small surplus, so always round up.
Common Concrete Projects
| Project | Size | Depth | Est. Yards |
|---|---|---|---|
| Patio (10×10) | 100 sq ft | 4 inches | ~1.2 |
| Driveway (20×20) | 400 sq ft | 5 inches | ~6.2 |
| Sidewalk (4×20) | 80 sq ft | 4 inches | ~1.0 |
| Garage (24×24) | 576 sq ft | 6 inches | ~10.7 |
| Footing (12" round) | 36" deep | — | ~0.07 each |
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