How much stone mulch do I need?
Same math as gravel: sq ft × depth in feet ÷ 27 = cubic yards. A 50 sq ft bed at 3" depth needs about 0.46 cubic yards — round up.
Stone Mulch Calculator
Stone mulch beds use 2–4 inches of decorative rock over landscape fabric. Enter bed dimensions — default depth is 3 inches for typical shrub borders.
Garden beds
ft
in
ft
in
Project settings
Default 3" for mulch beds
Default 10% for settling
$
Related guides
Frequently asked questions
Stone mulch vs wood mulch?
Stone does not decompose and rarely needs topping up. Wood mulch breaks down and needs refresh every 1–2 years. Stone is heavier — confirm delivery access.
What depth for river rock beds?
2–3 inches is common for decorative rock over fabric. Use 4 inches only if you want a thicker visible layer — depth increases weight and cost quickly.
Related calculators
Mulch Calculators · https://mulch-calculators.com/stone-mulch-calculator/