Concrete Calculator

Estimate concrete volume, bags, and material cost

ConcreteGator converts project dimensions into cubic yards or cubic meters, then estimates common 40, 60, and 80 lb ready-mix bag quantities. Start by choosing the project shape that matches the pour. Use the slab calculator for rectangular pads, patios, driveways, and floors; the footing calculator for continuous strip footings; the Sonotube calculator for round piers and columns; or the steps calculator for a solid stair profile.

Enter the finished dimensions shown on your plan or forms. Imperial measurements can mix feet and inches, while metric measurements can mix meters and centimeters. The result is the geometric volume of the shape. Real excavations and forms can vary, so confirm the dimensions in the field and discuss an appropriate ordering allowance with your concrete supplier.

Calculate sections with different shapes or depths separately, then add their volumes. This keeps thickened edges, pads, landings, and irregular areas visible instead of hiding them inside one rough measurement.

If you already know the required volume, open the bags of concrete calculator to compare bag sizes and estimated cost. For planning help, read our guides to slab thickness, bag yields, and concrete reinforcement. The calculator estimates material; it does not replace structural design, local code, or supplier guidance.