Concrete Slab Calculator
Enter slab dimensions in feet or meters and get an immediate planning estimate.
Open slab calculatorConcrete project tools
Plan a concrete project from the ground up.
Start with the quantity you need. Plan Otter’s concrete tools use transparent formulas and sourced material assumptions, with no invented local pricing.
Concrete calculator
Concrete slab volume and materials
Estimate concrete for patios, walkways, pads, shed bases, and other rectangular or square slabs. Adjust thickness and waste to match your plan.
- Cubic feet and cubic yards
- Waste-adjusted order quantity
- 40, 60, and 80 lb bag equivalents
- Print or save the estimate
Before you calculate
Measure the planned slab footprint and choose a thickness appropriate to the project. Structural needs, reinforcement, base preparation, soil, drainage, and local codes vary. Use the result as a planning estimate, then confirm project requirements and delivery details with qualified local professionals and suppliers.