Concrete Calculator
Free concrete calculator — updated for 2025. Accurate, instant, no sign-up needed.
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Concrete Calculator
Calculate concrete volume for slabs, columns & footings
Cubic Yards
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Cubic Feet
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80 lb Bags
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💡 Always order 10% extra concrete to account for spillage and uneven sub-base.
Concrete Calculation
Volume (cu ft) = Length × Width × (Thickness ÷ 12)
Volume (cu yd) = cu ft ÷ 27
How thick should a concrete slab be?
Standard: 4 inches for patios/walkways, 6 inches for driveways, 8+ for heavy loads. Always use appropriate rebar or wire mesh reinforcement.