Mulch Calculator
Calculate cubic yards of mulch needed for any garden bed.
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How It Works
Calculates cubic yards: length x width x depth inches / 324. One cubic yard covers 108 sq ft at 3 inch depth.
Formula
Cubic yards = L x W x D / 324Quick Reference
Common calculations — results you can verify instantly.
100 sq ft, 3in deep
100×3/324
0.93 cu yd
500 sq ft, 2in deep
500×2/324
3.09 cu yd
1 cu yd covers
At 3in depth
108 sq ft
Tips & Shortcuts
2-3 inches optimal for moisture retention and weed suppression.
Keep 6-inch gap from tree trunks to prevent rot.
Common Mistakes
Forgetting to order extra for compaction
Order 10% extra. Mulch compacts over time.
Piling mulch against tree trunks
Mulch volcanoes harm trees. Keep gap from trunk.
Frequently Asked Questions
100 x 3 / 324 = 0.93 cubic yards. Order 1 cubic yard.
2 cu ft bags: 13.5 bags. 3 cu ft bags: 9 bags.
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