Concrete Bag Calculator — Fast & Simple
Enter your dimensions (slab or post holes) or a total volume and instantly see how many 40, 50, 60, and 80 lb bags you need. The tool also shows total weight, estimated mixing water, and optional cost. Perfect for patios, sheds, fence posts, and small pours.
Default Yields (per bag)
- 40 lb ≈ 0.30 ft³
- 50 lb ≈ 0.375 ft³
- 60 lb ≈ 0.45 ft³
- 80 lb ≈ 0.60 ft³
Quick Answers
- How many 80 lb bags in a yard? ≈ 45 bags
- How many 60 lb bags in a yard? ≈ 60 bags
- How much water per 80 lb bag? ~3–4 quarts (follow product label)
Related Tools
Planning more work? Try the Concrete Slab Calculator and Gravel Calculator.
Estimates only. Actual yields vary by brand, moisture, compaction, and site conditions.