Slabs and pavement
- Slab calculatorgarage slabs, shed bases, pads, flatwork
- Driveway calculatorresidential driveway slabs
- Patio calculatorbackyard patios and outdoor pads
- Sidewalk calculatorwalkways and narrow slab pours
Concrete
Concrete calculators by pour type
Choose the closest job shape first. The calculator then keeps the inputs, waste allowance, bag counts, and supplier note aligned with how the pour will actually be ordered.
Forms and reinforcement
- Wall calculatorlength, height, and thickness
- Footing calculatorcontinuous strip footings
- Stairs calculatorsolid stair pours
- Column calculatorround columns and piers
- Rebar calculatorreinforcement grid planning
Bags and conversions
- Bag calculator40, 60, and 80 lb bag counts
- Cubic yards calculatorconvert dimensions to yd³
- Cubic feet calculatorconvert dimensions to ft³
- Post hole calculatorfence posts, deck posts, piers
How it works
Use finished dimensions, then check the assumptions
Each calculator takes finished pour dimensions and converts them into the quantities you need at the supplier: cubic yards for ready-mix orders, or 40, 60, and 80 lb bag counts for smaller pours. Most calculators include a safety margin recommendation so the order covers spillage, uneven subgrade, and small measurement errors.
For most flatwork, a 4 inch slab is standard, with 5 to 6 inches used for driveways or heavier loads. For structural work, footings, frost-depth requirements, and load capacity should always be checked against local code before pouring.