Concrete volume from explicit geometry

Planning workflow

1. Split the concept into shapes with a known length, width, and depth or section area.
2. Calculate each volume in one consistent unit system.
3. Sum the shapes, then show the user-selected placement allowance separately.
4. Confirm mix, reinforcement, joints, subbase, moisture, weather, access, and order quantity professionally.

Formula or decision logic

Rectangular volume V = L x W x T. Imperial cubic yards = cubic feet / 27; metric volume remains cubic meters. For a continuous footing, V = section width x section depth x centerline length. Do not double-count intersecting volumes.

Worked planning example

A 24 ft by 30 ft slab at 4 inches thick is 24 x 30 x (4/12) = 240 cubic feet, or 8.89 cubic yards before any allowance. A thickened perimeter is not included. If it is required, calculate only its additional cross-section to avoid counting the base slab twice.

Limitations and review boundary

• The calculator does not choose thickness, reinforcement, subbase, joints, or mix.
• Excavation and irregular grade can change actual placement.
• Supplier minimums, truck access, testing, and field waste require local coordination.

Continue in materials