Concrete Calculator By Square Foot

Concrete Volume Formula:

\[ V = \frac{SqFt \times Depth}{27} \]

Volume (cu yd):

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

Purpose: It helps construction professionals and DIYers determine how much concrete is required for projects like slabs, patios, and foundations.

The calculator uses the formula:

\[ V = \frac{SqFt \times Depth}{27} \]

Where:

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

Details: Accurate concrete volume estimation ensures proper structural support, avoids material waste, and helps with cost planning.

Tips: Enter the area in square feet and desired depth in feet. All values must be > 0.

Q1: Why divide by 27?
A: There are 27 cubic feet in 1 cubic yard, so we divide to convert from cubic feet to cubic yards.

Q2: What's a typical slab depth?
A: Residential slabs are typically 4 inches (0.33 ft), driveways 5-6 inches, and heavy-duty slabs 6-8 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 project contingencies.

Q5: How many bags of concrete would this be?
A: Multiply cubic yards by 45 to estimate 80lb bags needed (1 cu yd ≈ 45 bags).