How Much Mulch for 100 Square Feet?

Q: How Much Mulch for 100 Square Feet?

To cover 100 sq ft with mulch 3 inches deep you need 0.93 cubic yards (25 cu ft). In bags, that's 13 bags of 2 cu ft or 9 bags of 3 cu ft.

To cover 100 sq ft with mulch 3 inches deep you need 0.93 cubic yards (25 cu ft). In bags, that's 13 bags of 2 cu ft or 9 bags of 3 cu ft.

Change any number below to match your project. The mulch calculator works for any size.

How it's worked out

Volume: 100 sq ft × 3 in ÷ 12 = 25 cu ft
Cubic yards: 25 ÷ 27 = 0.93 yd³
2 cu ft bags: 25 ÷ 2 = 13 bags

100 sq ft at other depths

Depth	Cubic yards	2 cu ft bags	3 cu ft bags
2 in	0.62	9	6
3 in	0.93	13	9
4 in	1.23	17	12

Use 2 inches to top up existing mulch, 3 inches for new beds, and up to 4 inches where weeds are a problem. For this amount, bags are often simpler than a bulk delivery with a minimum charge.

Other common sizes

100 sq ft
200 sq ft
300 sq ft
500 sq ft
1,000 sq ft

More detail: Bulk vs Bagged Mulch: How Much You Need and Which Is Cheaper