Concrete Calculator

📐How Concrete Volume Is Calculated

1. 1Slab/Footing: Volume = length × width × depth. Result is in cubic feet.
2. 2Column: Volume = π × radius² × height (cylinder formula).
3. 3Convert cubic feet to cubic yards by dividing by 27 (1 cubic yard = 27 cubic feet).
4. 4Concrete is typically sold by the cubic yard. Add 5–10% extra to account for spillage and uneven sub-base.
5. 5One 60 lb bag = ~0.45 ft³. One 80 lb bag = ~0.60 ft³.

* For large pours (>1 cubic yard), ready-mix delivery is more economical than bags. Always wear appropriate safety gear when mixing concrete.