Mulch and Gravel Calculator
A mulch and gravel calculator estimates landscaping material volumes in cubic yards, tons, and retail bags based on garden bed dimensions and coverage depth. By converting bed square footage into cubic yards, it confirms that covering a 200-square-foot garden at a 3-inch depth requires 1.85 cubic yards.
By Sofia Marchetti (Home & Wellness Reviewer) · Reviewed by Daniel OkoroUpdated · Published
Length (ft)
0ft
Width (ft)
0ft
Thick (in)
0in
CONCRETE VOLUME
Total: 0.0 cu ft | Approx. 0 bags (80 lb)
How Does the Mulch & Gravel Calculator Work?
- Enter length and width of the garden bed in feet.
- Specify desired mulch depth in inches (typically 2" to 3").
- The calculator computes cubic yards and number of standard 2 cu ft retail bags.
What Is the Mulch & Gravel Formula?
Cubic Yards = (Length ft × Width ft × Depth in / 12) / 27
Calculates volume in cubic yards for bulk delivery or 2 cubic foot retail bags.
Variables
Depth in:Typically 2 to 3 inches for mulch
How Do You Calculate Mulch & Gravel Step by Step?
Mulching a garden bed measuring 20 ft by 6 ft at 3 inches deepLength: 20 ft
Width: 6 ft
Depth: 3 in
Area = 20 × 6 = 120 sq ft
Volume = 120 × (3 / 12) = 30 cubic feet
Cubic yards = 30 ÷ 27 = 1.11 cubic yards
Standard 2 cu ft bags = 30 ÷ 2 = 15 bags
Final Solution:1.11 Cubic Yards (or 15 two-cubic-foot bags)
Mulch & Gravel Questions and Answers
A depth of 2 to 3 inches is ideal for weed suppression, moisture retention, and plant health. Excessive mulch over 4 inches can suffocate roots.
Where Do These Mulch & Gravel Standards Come From?
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