Build · Project tools
Estimate concrete for slabs and rectangular pours in cubic yards, with optional bag counts.
Add separate sections for irregular spaces. Avoid overlaps. Use 10.5 ft for 10 ft 6 in.
Use your plan, product label or supplier’s specifications.
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Understand the number
Area in square feet × thickness in inches ÷ 324 = cubic yards. Apply the allowance, then divide total cubic feet by the bag’s stated yield if you need a bag count.
Measure the pour boundaries and use the thickness shown on the project plan. Enter sections with different thicknesses in separate estimates. Thickened edges, footings, grade beams and other deeper areas need additional volume; they are not automatically included in a simple slab footprint.
Ask the supplier to confirm the mix, delivery terms, minimum order and placement schedule. Reinforcement, base preparation, forms, joints, pumping, access and finishing are outside this volume calculation. An uneven base can change the required quantity. This tool does not choose a structural slab thickness, strength or reinforcement design.
Published by Gulf Coast Project Pros · September 15, 2026. Calculations use your inputs; product suitability and project requirements must be checked separately. Report a correction.