Concrete Calculator
Calculate concrete volume in cubic yards, cubic feet and cubic metres for slabs, footings and columns, including bag counts and waste allowance.
Cubic yards
1.36
Cubic metres
1.038
Cubic feet
36.7
Pre-mixed bags required
| Bag size | Yield | Bags needed |
|---|---|---|
| 80 lb | 0.60 ft³ | 62 |
| 60 lb | 0.45 ft³ | 82 |
| 40 kg | 0.018 m³ | 58 |
Formula
Volume = length × width × thickness (slab) · π × r² × height (column)
Results are converted using exact factors: 1 yd³ = 0.764554857984 m³ and 1 ft³ = 0.028316846592 m³. Bag yields are the manufacturer-published dry-mix yields for standard 4,000 psi mixes; check your product bag, as high-strength and fast-setting mixes yield slightly less.
Cite this page
UnitConvertLab. (2026). Concrete Calculator. UnitConvertLab. Retrieved from https://unitconvertlab.com/hi/tools/concrete-calculator