Supply MathHow much does one bag make?
| Bag | Yield (ft³) | Bags per yd³ | Covers at 4 in |
|---|---|---|---|
| 80 lb | 0.6 | 45 | 1.8 sq ft |
| 60 lb | 0.45 | 60 | 1.35 sq ft |
| 40 lb | 0.3 | 90 | 0.9 sq ft |
Yields from the Quikrete Concrete Mix (No. 1101) data sheet. Other brands are similar; check the bag.
Frequently asked questions
How much does an 80 lb bag of concrete cover?
An 80 lb bag makes about 0.60 cubic feet: about 1.8 sq ft at 4 inches thick, or 3.6 sq ft at 2 inches.
Is it cheaper to buy 60 lb or 80 lb bags?
Compare the price per cubic foot: divide the bag price by its yield (0.45 ft³ for 60 lb, 0.60 ft³ for 80 lb). 80 lb bags usually work out slightly cheaper and need fewer trips, while 60 lb bags are easier to lift.