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20kg Bag of Stone Cover Calculator

Coverage Area Formula:

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

kg
kg/cu yd
inches

1. What is a 20kg Bag of Stone Cover Calculator?

Definition: This calculator estimates the area that can be covered by a bag of stone based on the bag weight, stone density, and desired depth.

Purpose: It helps landscaping professionals and DIYers determine how much area a standard 20kg bag of stone will cover for projects like pathways or decorative ground cover.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ A = \frac{W}{D} \times \frac{12}{d} \]

Where:

  • \( A \) — Coverage area (square feet)
  • \( W \) — Bag weight (kg)
  • \( D \) — Stone density (kg/cubic foot)
  • \( d \) — Desired depth (inches)
  • 12 — Inches per foot conversion

Explanation: The formula calculates the volume of stone in the bag, then determines how much area that volume can cover at the specified depth.

3. Importance of Coverage Calculation

Details: Accurate coverage estimation ensures proper material purchasing, prevents project delays, and helps with budget planning.

4. Using the Calculator

Tips: Enter the bag weight in kg (default 20), stone density (default 1600 kg/cu yd), and desired depth in inches (default 2). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is density important in this calculation?
A: Different stone types have different densities, which affects how much volume a given weight will occupy.

Q2: What's a typical stone density?
A: Most decorative stones range from 1400-1800 kg per cubic yard, with 1600 kg/cu yd being a common average.

Q3: How does depth affect coverage?
A: Coverage area is inversely proportional to depth - doubling the depth halves the coverage area.

Q4: Can I use this for other bag sizes?
A: Yes, simply change the weight value to match your bag size while keeping other parameters accurate.

Q5: Does this include compaction or waste?
A: No, consider adding 10-15% to the calculated amount for compaction and project contingencies.

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