Concrete Calculator
Work out how much concrete you need for a slab, in volume and 80 lb bags.
Inputs
Results
Concrete Needed
1.2 m³
80 lb Bags
71 bags
How it's calculated
Volume = length × width × thickness (converted to metres). An 80 lb bag yields roughly 0.017 m³, so the number of bags is the volume divided by 0.017, rounded up.
Related calculators
- Paint Calculator
Estimate how much paint you need to cover the walls of a room, per coat.
- Square Footage Calculator
Calculate the area of any rectangular space for flooring, tiling, or landscaping.
- Paver Calculator
Work out how many pavers you need for a patio or walkway, including a waste allowance for cuts.
- Mulch and Topsoil Calculator
Convert a bed's area and depth into the cubic yards, cubic feet, and bags of mulch or soil to order.
- Fence Calculator
Plan a fence run: how many posts, sections, and bags of concrete you need for the footings.
- Percentage Calculator
Work out what a given percentage of a number is — like 15% of 200.