Concrete Calculator — Free Online Calculator with Step-by-Step Guide
Calculate the exact volume of concrete needed for slabs, holes, columns, and stairs. Outputs cubic yards plus the number of 60-lb and 80-lb bags required.
Concrete Calculator
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Enter Values
Volume
33.33 cu ft
60-lb Bags
75
80-lb Bags
56
Total Weight (80lb bags)
4480 lbs
Waste Allowance
None (exact)
Shape
Slab/Patio
Formula
Volume = Length × Width × (Depth / 12)
Scenario Comparison
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Concrete Needed
1.23 cu yd
33.33 cu ft
Shape: Slab/Patio (V = L × W × D)
Bag Comparison
60-lb Bags
75
0.45 cu ft each
80-lb Bags
56
0.60 cu ft each
Home Depot Ready
Quick Reference
1 cu yd
= 27 cu ft
80lb bag
~0.6 cu ft
60lb bag
~0.45 cu ft
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