🏗️ Masonry & Foundation Volume Estimator
Concrete Slab & Footing Volume Calculator
Estimate ready-mix cubic yards, cubic meters, and 60 lb / 80 lb premix bags for rectangular patio slabs, foundations, or cylindrical post holes.
Structure Dimensions
4 inches = Standard Patio / Sidewalk, 6 inches = Driveway
Total Concrete Volume Needed
2.72 Cu Yards
80 lb Premix Bags
123 Bags
0.60 cu ft per bag
60 lb Premix Bags
163 Bags
0.45 cu ft per bag
💡 Delivery Advice:
For projects requiring over 1.5 - 2.0 cubic yards, ordering a ready-mix concrete delivery truck is significantly faster and more economical than hand-mixing individual 80lb bags.
How to Calculate Concrete Volume
Concrete volume is calculated in cubic feet and converted to cubic yards ($1\text{ yard}^3 = 27\text{ ft}^3$):
- Slab Volume: $$\text{Cu Yards} = \frac{\text{Length (ft)} \times \text{Width (ft)} \times (\text{Thickness (in)} / 12)}{27}$$
- Cylinder Volume: $$\text{Cu Yards} = \frac{\pi \times (\text{Radius in ft})^2 \times \text{Depth (ft)}}{27} \times \text{Count}$$