Free Mulch Calculator. Enter your garden bed dimensions and desired depth to calculate how many cubic yards or bags of mulch you need.
🌿 Mulch Calculator
💡 Pro Tip
Apply mulch in late spring after the soil has warmed. Avoid piling mulch against tree trunks (volcano mulching) as it traps moisture and causes bark rot.
Frequently Asked Questions
Q: How deep should mulch be?
Apply 2–4 inches of mulch around plants. Too thin (under 2 inches) won't suppress weeds effectively; too thick (over 4 inches) can prevent water penetration and cause root rot.
Q: How many cubic yards of mulch do I need?
Cubic yards = (Length ft × Width ft × Depth inches) ÷ 324. One cubic yard covers 324 square feet at 1 inch deep.
Q: How many bags of mulch equal a cubic yard?
One cubic yard of mulch equals about 13.5 bags of 2-cubic-foot bags, or 9 bags of 3-cubic-foot bags.

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