How much mulch for 100 square feet?
Quick Answer
For 100 square feet at the recommended 3-inch depth, you need 0.93 cubic yards of mulch — about 25 cubic feet. That's roughly 7 bags of 2-cubic-foot bagged mulch, or 13 bags of the smaller 1.5-cubic-foot bags. For larger areas, bulk mulch by the yard is significantly cheaper.
Quick Reference Table
| Area | Mulch Needed (3" depth) |
|---|---|
| 50 sq ft | 0.46 yd³ / 4 bags (2 cu ft) |
| 100 sq ft | 0.93 yd³ / 7 bags |
| 200 sq ft | 1.85 yd³ / 14 bags |
| 500 sq ft | 4.63 yd³ / 35 bags |
| 1,000 sq ft | 9.26 yd³ / 70 bags |
| 2,000 sq ft | 18.5 yd³ — order bulk |
How to Calculate It Yourself
- 1
Measure your bed area in square feet (length × width for rectangles).
- 2
Choose depth: 2 inches for topdressing existing beds, 3 inches for new beds, 4 inches for weed suppression.
- 3
Calculate cubic feet: area × depth (in) ÷ 12. For 100 sq ft at 3": 100 × 3 ÷ 12 = 25 cubic feet.
- 4
Convert to cubic yards: 25 ÷ 27 = 0.93 yd³. Or to bags: 25 ÷ 2 = 12.5 → buy 13 bags of 2 cu ft.
Pro Tip
Bulk mulch (delivered by the yard) costs $25–45/yd³. Bagged mulch at $4–6 per 2-cu-ft bag works out to $54–81/yd³ — 2–3× more expensive. The break-even point is around 3 cubic yards (about 300 sq ft at 3" deep). Order bulk for anything larger.
Assumptions to Check
Before ordering materials, confirm the dimensions, product coverage, waste factor, and local installation requirements for your project. Manufacturer coverage tables and local code rules can change the final quantity, especially for structural work, exterior projects, and irregular layouts.
Need an exact number for your specific dimensions?
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