Concrete Bag Calculator
Find out exactly how many bags of concrete you need for your project. Enter your dimensions and bag size to get instant results including total bags, weight, and volume.
Concrete Bag Yields
Each bag size produces a different volume of mixed concrete:
- 40 lb bag: 0.011 cubic yards (0.30 cubic feet) per bag — about 90 bags per cubic yard
- 60 lb bag: 0.017 cubic yards (0.45 cubic feet) per bag — about 59 bags per cubic yard
- 80 lb bag: 0.022 cubic yards (0.60 cubic feet) per bag — about 45 bags per cubic yard
When to Use Bags vs. Ready-Mix
- Use bags for: Small projects under 0.5 cubic yards, post holes, small repairs, and areas without truck access
- Use ready-mix for: Projects over 1 cubic yard, driveways, large slabs, and any project where consistent quality matters
- Cost comparison: Bags cost $250-$350 per cubic yard; ready-mix costs $125-$165 per cubic yard delivered
Mixing Tips for Bagged Concrete
- Use about 3 quarts of water per 80lb bag (adjust for desired consistency)
- Mix for at least 3-5 minutes until uniformly blended
- Use within 1-2 hours of mixing — concrete begins to set after that
- A wheelbarrow can hold about 2-3 bags of mixed concrete at a time
- Work in batches for larger projects to ensure proper mixing
Frequently Asked Questions
How many 80lb bags of concrete are in a cubic yard?
There are approximately 45 bags of 80lb concrete mix in one cubic yard. Each 80lb bag yields about 0.022 cubic yards (0.6 cubic feet) of mixed concrete. For large projects over 1 cubic yard, consider ordering ready-mix concrete for better value.
How many 60lb bags of concrete are in a cubic yard?
There are approximately 59 bags of 60lb concrete mix in one cubic yard. Each 60lb bag yields about 0.017 cubic yards (0.45 cubic feet) of mixed concrete.
How many bags of concrete do I need for a 10x10 slab?
For a 10×10 foot slab at 4 inches thick, you need about 1.23 cubic yards of concrete. That equals approximately 56 bags of 80lb mix, 72 bags of 60lb mix, or 112 bags of 40lb mix. Add 10% extra for waste and spillage.