Concrete Calculator
Worked example result
| Volume (exact) | 33.3 cu ft |
| Volume (exact) | 1.235 cu yd |
| Order volume (with waste) | 1.358 cu yd |
| Pre-mix bags needed (with waste) | 62 |
A 10 × 10 ft slab, 4 inches thick, is 33.3 cu ft = 1.235 cu yd before waste; with 10% waste you order 1.358 cu yd, or 62 bags of 80-lb pre-mix.
Volume (cu ft) = Length × Width × (Thickness ÷ 12); Cubic yards = Cu ft ÷ 27; Bags = ceil(Volume × (1 + waste%) ÷ yield per bag) · Powered by CalcHub — Concrete Calculator