Free DIY and material calculators
Estimate material quantities for common projects. Every calculator includes an explanation of the formula, a worked example and practical buying considerations.
Flooring & Tile
Walls & Surfaces
Outdoor & Materials
Concrete Calculator
Estimate volume for a rectangular concrete slab and an approximate bag count.
Open calculator →Outdoor & MaterialsGravel Calculator
Estimate cubic yards and approximate tons of gravel using adjustable density.
Open calculator →Outdoor & MaterialsMulch Calculator
Estimate cubic yards and bags of mulch for a rectangular landscape bed.
Open calculator →Outdoor & MaterialsDecking Calculator
Plan deck surface board quantities for a rectangular layout.
Open calculator →Outdoor & MaterialsFence Calculator
Estimate basic materials for one straight picket-fence run.
Open calculator →Planning
How to use these estimates
Start with accurate measurements, choose the product-specific values shown on the packaging, and review the stated formula. Some products are sold by full carton or bag, while others are sold by volume or weight. Treat results as planning estimates and confirm quantities with the supplier before ordering.
Learn the complete material-estimating process →