How to use this concrete calculator
Enter slab length, width and thickness to estimate cubic feet, cubic yards and approximate 80 lb bags.
How the calculation works
Volume = length × width × thicknessCubic yards = cubic feet ÷ 2780 lb bags ≈ cubic feet ÷ bag yieldAdvertisementGoogle AdSense placeholder
Example project
A 10 × 10 ft slab at 4 inches thick is about 33.3 cu ft or 1.23 cubic yards.
Practical tips
- Confirm slab thickness.
- Large pours may suit ready-mix delivery.
- Site conditions can change quantity.
Frequently asked questions
How many cubic feet in a yard?
27 cubic feet.
How much does an 80 lb bag yield?
Often about 0.60 cu ft; check the label.
Should I order extra?
Critical pours should follow supplier or contractor guidance.