Home » All Calculators » Construction and Civil Engineering » Decomposed Granite Calculator

Decomposed Granite Calculator

Photo of author
Published on

A Decomposed Granite (DG) Calculator is a tool designed to help homeowners, landscapers, and construction professionals estimate the amount of decomposed granite required for various landscaping and paving projects. Decomposed granite, a natural stone aggregate, is popular for its aesthetic appeal, durability, and permeability. It is commonly used for pathways, driveways, and as a base material for paving stones.

Purpose and Functionality

The purpose of the DG Calculator is to simplify the planning process for projects involving decomposed granite. By providing measurements of the area to be covered, the calculator efficiently computes the volume of material needed, ensuring cost-effectiveness and minimizing waste.

Formula and Calculations

The calculator uses a simple formula to estimate the volume of decomposed granite required:



  • V is the volume needed,
  • L is the length of the area,
  • W is the width, and
  • D is the depth of decomposed granite desired.

Given the variability in measurement units, depth conversions are necessary:

  • For imperial units: Convert inches to feet by dividing by 12.
  • For metric units: Convert centimeters to meters by dividing by 100.

These conversions ensure that all measurements are in consistent units for calculating the volume. The final volume may then be converted into cubic yards or meters, depending on the preferred unit of purchase.

Step-by-Step Example

Let's consider a practical example: You're planning a garden path 20 feet long and 10 feet wide, intending to cover it with a 3-inch layer of decomposed granite.

  1. Convert Depth: Convert the depth from inches to feet: 3 inches/12=0.25 feet3 inches/12=0.25 feet.
  2. Calculate Volume: Compute the volume in cubic feet: 20×10×0.25=50 cubic feet20×10×0.25=50 cubic feet.
  3. Convert Volume: Since decomposed granite is often sold by the cubic yard, convert cubic feet to cubic yards: 50 cubic feet/27≈1.85 cubic yards50 cubic feet/27≈1.85 cubic yards.

You would need approximately 1.85 cubic yards of decomposed granite for your garden path.

Relevant Information Table

To further aid in planning, here's a table summarizing depth conversions and volume calculations for common project sizes:

Project Size (ft*ft)Depth (inches)Depth (feet)Volume (cubic feet)Volume (cubic yards)
10 x 1030.25250.93
20 x 1030.25501.85
30 x 1540.331505.56
40 x 2060.540014.81


The Decomposed Granite Calculator is an invaluable resource for ensuring the successful completion of landscaping projects. It not only facilitates precise material estimations but also contributes to efficient resource utilization and budget management. Whether for a small garden path or a large driveway, this calculator helps in achieving professional-grade results with minimal effort and maximum accuracy. By streamlining the planning phase, it allows for more time and energy to be spent on the creative aspects of landscaping and construction projects.

Leave a Comment