Mulch and Stone Calculator: Accurate Material Estimates for Your Landscape

By a Certified Arborist

May 2, 2025

Quick answer: To find cubic yards of mulch, multiply the length by the width (in feet) and by the depth (in inches), then divide by 324. For example, a bed 10 feet by 10 feet and 3 inches deep needs about 0.93 cubic yards (25 cubic feet), or 13 bags of 2 cubic feet. The calculator above does the math for beds, circles, mulch rings around trees, stone, and topsoil.

Using a Mulch and Stone Calculator ensures you purchase the right amount of material, with no waste and no shortage. Whether you’re applying hardwood mulch or setting decorative stone for drainage, our tool converts your measurements into cubic yards and example cost estimates instantly.

• Measure your area’s length and width in feet.
• Choose desired depth in inches (2–4″ for mulch: 2–3″ for fine mulch, 3–4″ for coarse wood chips; about 1″ of small stone controls weeds).
• Pick what you are covering (a mulch bed, a ring around a tree, stone, or topsoil). Then pick the material, like hardwood mulch, pine bark, or gravel, and the bag size.
• Tap “Get the amount” to see cubic yards, cubic feet, and bags. Mulch beds and tree rings also show an example cost. Tap “Add to my list” to add up several beds.

• Maintains soil moisture and temperature
• Suppresses weeds and reduces maintenance
• Enhances curb appeal and property value
• Prevents erosion and excess runoff

Keep mulch 2–3″ away from tree trunks and 6–12″ from house walls (Clemson Extension). For optimal root health, never exceed recommended depth. Choose lighter-colored stone in sunny spots to reduce heat absorption.

Mulch has so many benefits for your home and landscape. There is not a better time to start than now!