Concrete Calculator by Square Footage to Yard Size

Concrete Volume Formula:

\[ V = \frac{A \times D}{27} \]

Concrete Volume (cu yd):

Definition: This calculator estimates the volume of concrete needed in cubic yards based on the area in square feet and depth in inches.

Purpose: It helps construction professionals and DIYers determine how much concrete is required for slabs, footings, and other flatwork projects.

The calculator uses the formula:

\[ V = \frac{A \times D}{27} \]

Where:

Explanation: The area is multiplied by depth (converted to feet) to get cubic feet, then divided by 27 to convert to cubic yards.

Details: Accurate concrete volume estimation ensures proper material ordering, minimizes waste, and helps with project budgeting.

Tips: Enter the area in square feet and depth in inches. The calculator automatically converts depth to feet in the calculation.

Q1: Why divide by 27?
A: There are 27 cubic feet in 1 cubic yard (3 feet × 3 feet × 3 feet).

Q2: What's a typical slab depth?
A: Residential slabs are typically 4 inches, driveways 5-6 inches, and footings 8-12 inches.

Q3: How do I measure irregular areas?
A: Break into rectangles, calculate each separately, then sum the volumes.

Q4: Does this include waste or overage?
A: No, consider adding 5-10% to the calculated volume for spillage and over-excavation.

Q5: How many bags of concrete mix would I need?
A: One cubic yard equals about 45 80-lb bags of concrete mix.

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