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Landscaping Gravel & Mulch Calculator

Use our free online Gravel & Mulch Calculator to perform fast, accurate calculations with instant formulas, step-by-step arithmetic, and verified reference benchmarks.

Gravel & Mulch Calculator

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Adjust inputs on the left for instantaneous live computation.

How to Calculate: The Gravel & Mulch Calculator Formula

Cubic Yards = [ Length (ft) × Width (ft) × (Depth (in) / 12) ] / 27 | Tons = Cubic Yards × Material Bulk Density

Calculates volumetric cubic yards (27 cubic feet = 1 cubic yard) and converts to tons (approx 1.4 tons per cubic yard for crushed gravel).

Step-by-Step Calculation Guide

  1. Input landscape bed length and width in feet.
  2. Enter desired coverage depth in inches (standard: 3 inches for mulch, 2 inches for pea gravel).
  3. Select material type (Bark Mulch, Pea Gravel, Crushed Stone, Topsoil).
  4. Review total cubic yards to order from quarry, or 2 cu ft retail bag counts.

Practical Gravel & Mulch Calculator Examples

Garden Bed Mulch (20 × 10 ft at 3 inches)

20 ft by 10 ft garden bed with 3-inch mulch layer.

Volume = 20 × 10 × (3 / 12) = 50 cu ft. In yards = 50 / 27 = 1.85 cubic yards. In 2 cu ft bags = 50 / 2 = 25 bags.
Order: 1.85 Cubic Yards (or 25 bags of 2 cu ft mulch).
Gravel Driveway (50 × 12 ft at 4 inches)

50 ft driveway × 12 ft wide, 4 inches deep.

50 × 12 × (4 / 12) = 200 cu ft / 27 = 7.41 cubic yards. At 1.4 tons/yd = 10.37 tons.
Order: ~7.5 Cubic Yards / 10.5 Tons of Gravel.

Landscaping Material Bulk Density and Weight Standards

Official reference values and benchmark classifications based on standard institutional guidelines.

Landscaping MaterialWeight per Cubic YardRecommended Depth2 Cu Ft Bags per Yard
Shredded Bark Mulch800 – 1,000 lbs (0.45 ton)3 Inches13.5 Bags
Screened Topsoil2,000 – 2,200 lbs (1.05 ton)4 – 6 Inches13.5 Bags
Crushed Stone / Gravel2,700 – 2,800 lbs (1.40 tons)2 – 3 InchesN/A (Bulk Order)
Pea Gravel / River Rock2,600 – 2,700 lbs (1.35 tons)2 InchesN/A (Bulk Order)
Coarse Sand2,700 lbs (1.35 tons)1 – 2 Inches (Paver base)N/A (Bulk Order)

Frequently Asked Questions about Gravel & Mulch Calculator

How deep should mulch be laid?

A depth of 2 to 3 inches is optimal for weed suppression and moisture retention without suffocating plant root oxygen uptake.

How many bags of mulch equal 1 cubic yard?

Since 1 cubic yard = 27 cubic feet, it takes 13.5 bags of standard 2-cubic-foot mulch (or 9 bags of 3-cubic-foot mulch) to equal one yard.

How many tons of gravel are in a cubic yard?

On average, one cubic yard of crushed gravel or limestone weighs approximately 1.35 to 1.45 tons (2,700 to 2,900 lbs).

Should I use landscape fabric under gravel?

Yes. Non-woven geotextile landscape fabric prevents gravel from sinking into the subsoil while allowing rainwater drainage and stopping weeds.

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