How to Calculate Gravel Yardage for Concrete Slab

Gravel Volume Formula:

\[ V = \frac{L \times W \times D}{27} \]

Gravel Volume (cu yd):

1. What is Gravel Yardage Calculation for Concrete Slab?

Definition: This calculator estimates the volume of gravel needed for a concrete slab based on the slab dimensions.

Purpose: It helps determine how much gravel base is required beneath a concrete slab for proper support and drainage.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ V = \frac{L \times W \times D}{27} \]

Where:

\( V \) — Volume of gravel (cubic yards)
\( L \) — Length of slab (feet)
\( W \) — Width of slab (feet)
\( D \) — Depth of gravel (inches, converted to feet)
27 — Conversion factor (cubic feet per cubic yard)

Explanation: The slab dimensions are multiplied together and divided by 27 to convert from cubic feet to cubic yards.

3. Importance of Proper Gravel Base

Details: A proper gravel base prevents settling, improves drainage, and provides a stable surface for concrete placement.

4. Using the Calculator

Tips: Enter the slab length and width in feet, and gravel depth in inches. Typical gravel depth is 4-6 inches for residential slabs.

5. Frequently Asked Questions (FAQ)

Q1: Why divide by 27 in the formula?
A: There are 27 cubic feet in 1 cubic yard, so this converts the volume from cubic feet to cubic yards.

Q2: What's a typical gravel depth for slabs?
A: Most residential slabs use 4-6 inches of compacted gravel base. Commercial slabs may require more.

Q3: Should I account for compaction?
A: Yes, gravel typically compacts about 15-20%. You may want to add this to your total volume.

Q4: How do I convert inches to feet for depth?
A: The calculator automatically converts inches to feet (divide by 12) in the calculation.

Q5: Does this include the concrete volume?
A: No, this calculates only the gravel base volume beneath the concrete slab.

Favorite