Materials calculator
Concrete Calculator
Estimate how much concrete you need for a slab, footing or rectangular pour.
Your measurements
Estimated result
Concrete volume0 cu ft
Cubic yards0 yd³
80 lb bags0 bagsApprox. 0.60 cu ft yield per bag
60 lb bags0 bagsApprox. 0.45 cu ft yield per bag
Planning estimate only. Check product specifications, site conditions and local codes before ordering or building.
Concrete volume formula
Volume = length × width × depth. Convert depth from inches to feet, then divide cubic feet by 27 for cubic yards.
Planning notes
Use the measured slab or pour dimensions, then add a waste allowance for uneven excavation, spillage and small measurement errors. Bag yields vary by product, so compare the estimate with the yield printed on the bag before buying.
- Measure depth in several places if the base is uneven.
- A 5–10% allowance helps cover spillage and uneven excavation.
Keep calculating
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