Mulch for a 4×20 area
0.74 cubic yards (10 bags)
of mulch for 80 sq ft at 3 inches deep: 20 cu ft, or 10 bags of 2 cu ft.
A 4×20 foot area is 80 square feet. Most garden beds need 2 to 3 inches of mulch; a fresh bed or a weedy one benefits from 3 to 4 inches.
Mulch for 4×20 by depth
| Depth | Cubic yards | Cubic feet | 2 cu ft bags | 3 cu ft bags |
|---|---|---|---|---|
| 1 in | 0.25 | 6.7 | 4 | 3 |
| 2 in | 0.49 | 13.3 | 7 | 5 |
| 3 in | 0.74 | 20 | 10 | 7 |
| 4 in | 0.99 | 26.7 | 14 | 9 |
| 6 in | 1.48 | 40 | 20 | 14 |
How it’s worked out
- 20 × 4 = 80 sq ft.
- 80 × 3 in ÷ 12 = 20 cu ft.
- 20 ÷ 27 = 0.741 cu yd, or 20 ÷ 2 = 10 bags of 2 cu ft (rounded up).
Change the numbers
Other bed sizes
- 3×20 area
- 4×15 area
- 4×25 area
- 5×20 area
- 4×12 area
- 2×20 area
- 4×10 area
- 4×30 area
- 6×20 area
- 4×8 area
- 4×6 area
- 4×5 area
Questions
- How much mulch do I need for a 4×20 area?
- 0.74 cubic yards at 3 inches deep, or 10 bags of 2 cu ft. At 2 inches it is 0.49 yards (7 bags).
- How many bags of mulch for 4×20?
- 10 bags of 2 cu ft or 7 bags of 3 cu ft at 3 inches deep.
- Is bulk or bagged mulch cheaper for 4×20?
- Bagged: about $40 for 10 bags. Bulk: about $40 for 0.74 yards, plus delivery. Bulk usually wins above 2 or 3 yards.