Concrete Calculator
Estimate the volume of concrete needed for a slab, footing, or column, plus the number of 60/80 lb bags.
- 60 lb bags75
- 80 lb bags56
How it works
Volume = length · width · thickness (in matching units). 1 yd³ ≈ 27 ft³.
10 ft × 10 ft × 4 in slab → 33.3 ft³ ≈ 1.23 yd³.
Frequently asked questions
- How many bags per yard?
- About 45 × 80 lb bags or 60 × 60 lb bags per cubic yard.
- Include waste?
- Add 5–10% for spillage and uneven ground.
- Ready-mix vs bags?
- Ready-mix is cheaper above ~1 yd³.
- What thickness for a driveway?
- Typically 4 inches for passenger cars; 6 for trucks.
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