Guide · Home Improvement
How Many Bags of Concrete per Cubic Yard?
How many bags of concrete per cubic yard? It depends on bag weight and yield: roughly 45 of the 80 lb bags, 60 of the 60 lb bags, or 90 of the 40 lb bags fill about one cubic yard before waste—then add ~10% and round up. Use the Concrete Calculator for slab dimensions.
Reviewed / updated August 2026
Quick answer (before waste)
| Bag size | Approx. yield | Bags per cu yd (exact) | | --- | --- | --- | | 40 lb | 0.30 cu ft | 90 | | 60 lb | 0.45 cu ft | 60 | | 80 lb | 0.60 cu ft | 45 |
After a 10% waste factor, multiply and round up (for example, 45 × 1.10 → 50 of the 80 lb bags per yard).
Open the Concrete Calculator to go from slab L×W×thickness straight to yards and bags.
Worked slab
A 10×10 ft pad at 4 inches ≈ 33.3 cu ft ≈ 1.23 cu yd. With 80 lb bags and 10% waste → about 62 bags.
Read the full workflow in How to estimate materials for any home project or browse Home Improvement calculators.
Draft notes
- Bag yields vary by brand and mix—check the label.
- Content status: draft stub — calculator is live; expand with more bag charts later.
Related calculators
Frequently asked questions
How many 80 lb bags of concrete make a yard?
At about 0.60 cubic feet per 80 lb bag, one cubic yard (27 cu ft) needs 27 ÷ 0.60 = 45 bags before waste. With a 10% buffer, plan on about 50 bags. Always confirm the yield printed on the bag.
Should I buy bags or order ready-mix?
Bags suit small pads and post holes. Once you need close to a cubic yard or more, ready-mix delivery is often cheaper and more consistent—compare your plant’s minimum load to bag totals.