1. What is a Gravel Calculator for Concrete Slab?

Definition: This calculator estimates the weight of gravel needed for a concrete slab base based on area, depth, and gravel density.

Purpose: It helps determine how much gravel is required to create a stable base for concrete slabs in construction projects.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Weight of gravel (tons)
• \( A \) — Area of the slab (square feet)
• \( D \) — Depth of gravel base (feet)
• \( \rho \) — Density of gravel (pounds per cubic foot)

Explanation: The formula calculates the volume of gravel needed and converts it to weight in tons.

3. Importance of Gravel Base for Concrete Slabs

Details: A proper gravel base provides drainage, prevents frost heave, and creates a stable foundation for the concrete slab.

4. Using the Calculator

Tips: Enter the slab area in square feet, desired gravel depth in feet, and gravel density (default 110 lb/ft³). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical depth for a gravel base?
A: For residential slabs, 4-6 inches (0.33-0.5 ft) is common. Commercial slabs may require 6-12 inches.

Q2: What density value should I use?
A: Most gravel has density between 100-130 lb/ft³. 110 lb/ft³ is a good average value.

Q3: Why divide by 2000 in the formula?
A: This converts pounds to tons (1 ton = 2000 pounds).

Q4: How do I calculate the area?
A: For rectangular areas, multiply length × width. For complex shapes, break into simple shapes.

Q5: Does this include compaction factor?
A: No, consider adding 10-15% to account for compaction during installation.