Concrete · Bag estimator
Buy the bags.
Skip the guesswork.
Choose the bag size, enter the pour dimensions, and include a practical allowance for uneven placement and waste.
Estimated bags needed
15 bagsBase volume8.0 ft³
With extra8.8 ft³
Bag yields are nominal. Confirm the manufacturer label and site conditions before purchase.
Method and assumptions
Volume divided by the manufacturer’s nominal bag yield.
We calculate rectangular volume in cubic feet, add your selected allowance, then round up to a whole bag. Typical yields are 0.30 ft³ for 40 lb, 0.45 ft³ for 60 lb, and 0.60 ft³ for 80 lb bags; verify the product label because mixes vary.