Concrete Bag Calculator

Enter your slab, footing, column, or post hole dimensions and see exactly how many 60 lb or 80 lb bags of concrete you need — plus which bag size is cheaper for your pour.

Length (ft)

Width (ft)

Thickness (in)

# of Pours

Waste Factor (%)

Pricing (edit to match local rates)

60 lb Bag ($)

80 lb Bag ($)

Volume Needed

36.7 cu ft

1.36 cu yd (incl. 10% waste)

Recommended Buy

80 lb Bags

62 bags · $480.50

Purchase Option	Quantity	Est. Cost
60 lb Bags	82 bags	$492.00
80 lb BagsBest value	62 bags	$480.50

Cheapest option: 80 lb Bags at $480.5080 lb bags almost always cost less per cubic foot than 60 lb bags, but the difference is usually small — pick based on how you're mixing and carrying them, not just price.

60 lb vs. 80 lb: it's about handling, not just costAn 80 lb bag yields more concrete per bag (fewer bags to open and mix) but is heavy to carry alone, especially over rough or sloped ground. 60 lb bags are easier to handle solo and mix in a wheelbarrow — a common tradeoff for DIY pours without a helper.

This is a material estimate only. Always add extra for uneven subgrade, spillage, and order a buffer — running short mid-pour is far costlier than a little leftover mix.