Concrete calculator
Published On: 25/02/2026
Concrete Calculator
Estimate how much concrete you need for a slab, footing, or circular pad. Enter dimensions and choose units. The calculator returns volume in cubic yards, cubic feet, and cubic meters, plus a recommended overage to reduce the risk of running short.
Inputs explained:
• Choose a shape (slab, footing, or circular).
• Enter length/width/thickness (or diameter/depth).
• Select units (feet/inches or meters/centimeters).
• Overage adds extra concrete (typically 5–10%) for spillage, uneven grade, and form gaps.
• Choose a shape (slab, footing, or circular).
• Enter length/width/thickness (or diameter/depth).
• Select units (feet/inches or meters/centimeters).
• Overage adds extra concrete (typically 5–10%) for spillage, uneven grade, and form gaps.
Typical slabs are 4 inches thick.
Tip: Many suppliers sell concrete by the cubic yard. For small jobs, you may also use bag estimates (not included here).
Concrete Calculator — Description
The Concrete Calculator estimates how much concrete you need for common projects like slabs, footings (trenches), and circular pads. Choose a shape, enter dimensions, select metric or imperial units, and the calculator will return the total volume in cubic yards, cubic feet, and cubic meters. It also includes an optional overage (5–10%) to help prevent running short.
This tool is useful for planning driveway pours, patios, shed slabs, fence post pads, and footing trenches.