Mulch cubic yards by area and depth
Mulch needs change rapidly with depth. This table gives transparent geometric volumes before compaction or supplier-specific recommendations.
Published August 30, 2026 · Reviewed September 3, 2026 · Method: BetterHomeHabits calculator model
Quick answer
To estimate mulch in cubic yards, multiply area in square feet by depth in feet, then divide by 27. For example, 500 square feet at 3 inches deep is about 4.63 cubic yards before any extra allowance.
Reference table
| Area | Depth | Cubic feet | Cubic yards |
|---|---|---|---|
| 100 sq ft | 2 in | 16.7 cu ft | 0.62 yd³ |
| 100 sq ft | 3 in | 25.0 cu ft | 0.93 yd³ |
| 100 sq ft | 4 in | 33.3 cu ft | 1.23 yd³ |
| 250 sq ft | 2 in | 41.7 cu ft | 1.54 yd³ |
| 250 sq ft | 3 in | 62.5 cu ft | 2.31 yd³ |
| 250 sq ft | 4 in | 83.3 cu ft | 3.09 yd³ |
| 500 sq ft | 2 in | 83.3 cu ft | 3.09 yd³ |
| 500 sq ft | 3 in | 125.0 cu ft | 4.63 yd³ |
| 500 sq ft | 4 in | 166.7 cu ft | 6.17 yd³ |
| 1,000 sq ft | 2 in | 166.7 cu ft | 6.17 yd³ |
| 1,000 sq ft | 3 in | 250.0 cu ft | 9.26 yd³ |
| 1,000 sq ft | 4 in | 333.3 cu ft | 12.35 yd³ |
Assumptions used
- Loose geometric volume
- No compaction factor
- Depth is uniform across the area
Why your result may differ
Beds rarely have perfectly uniform depth. Tapered edges, settling, existing mulch and the supplier’s bag or bulk unit can change the delivered quantity.
Methodology
Each row multiplies the stated square-foot area by depth in feet and divides cubic feet by 27; no settling or compaction factor is hidden.