Concrete Calculator
Convert slab, footing, column, or tube dimensions into cubic yards of concrete and 40/60/80-lb bag counts.
Processed locally in your browser — nothing is uploaded.
Identical pours
Spillage and uneven subgrade
Results
- Exact volume
- 1.235 yd³
- Order (with waste)
- 1.36 yd³
- 40-lb bags
- 124 bags
- 60-lb bags
- 80 bags
- 80-lb bags
- 62 bags
36.7 cubic feet
Bag yields follow common premixed-bag ratings; check the bag label for your brand.
About Concrete Calculator
Pick the pour shape — slab, footing, rectangular column, or round tube — enter its dimensions, and get the volume in cubic yards with a waste factor applied. It also converts the volume into 40, 60, and 80-lb premixed bag counts using the standard published yields (0.011, 0.017, and 0.022 yd³ per bag), all editable.
Common uses
- Order ready-mix for a patio slab without over- or under-shooting
- Count 80-lb bags for a handful of fence-post footings
- Size a sonotube pour for deck piers
Example
Input
Slab 10 × 10 ft, 4 in thick, 10% waste
Output
1.23 yd³ exact → order 1.36 yd³ or 62 × 80-lb bags
Limitations
- Bag yields are typical label values; brands vary slightly
- No allowance for uneven subgrade beyond the waste factor