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How to Calculate Concrete

Calculate how much concrete you need for slabs, round patios, and footings — cubic yards, cubic feet, 40/60/80 lb bag counts, and an estimated ready-mix cost.

The Formula

cubicFeet = length * width * depthInches / 12; cubicYards = cubicFeet / 27

The concrete formula uses the mathematical relationship: cubicFeet = length * width * depthInches / 12; cubicYards = cubicFeet / 27. Each variable in the formula represents a measurable quantity that affects the final result.

Step-by-Step Method

  1. 1Identify all input values needed for the concrete calculation.
  2. 2Substitute your known values into the formula: cubicFeet = length * width * depthInches / 12; cubicYards = .
  3. 3Perform the arithmetic operations in the correct order (PEMDAS/BODMAS).
  4. 4Check that your result has the correct units and is within a reasonable range.
  5. 5Verify using the interactive Concrete Calculator to confirm your answer.

Related Topics

concretecubic yardsslabpremix bagsready mixdrivewayfooting

Use the Interactive Calculator

Skip the manual math — get instant results with our free Concrete calculator.

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