1. What is a Concrete and Gravel Calculator?

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

Purpose: It helps construction professionals and DIYers determine how much gravel is required for concrete foundation projects.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Weight of gravel (tons)
• \( A \) — Area (square feet)
• \( D \) — Depth (feet)
• \( \rho \) — Density (pounds per cubic foot, typically 100-130)

Explanation: The area multiplied by depth gives volume, multiplied by density gives weight in pounds, divided by 2000 converts to tons.

3. Importance of Gravel Calculation

Details: Proper gravel estimation ensures stable concrete foundations, proper drainage, and accurate material purchasing.

4. Using the Calculator

Tips: Enter the area in square feet, depth in feet, and density (default 100 lb/ft³). All values must be > 0, with density between 100-130.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical density range for gravel?
A: Most gravel has a density between 100-130 pounds per cubic foot, depending on material type and moisture content.

Q2: How do I measure the area?
A: For rectangular areas, multiply length by width. For circular areas, use π × radius².

Q3: What depth should I use?
A: Typical gravel base depths are 4-6 inches (0.33-0.5 ft) for patios, 6-12 inches (0.5-1 ft) for driveways.

Q4: Why divide by 2000?
A: There are 2000 pounds in 1 ton, so this converts the weight from pounds to tons.

Q5: Does this include compaction factor?
A: No, consider adding 10-15% to the calculated weight for compaction and settling.