How Much Mulch for 150 Square Feet?

Answer at a glance — 150 sq ft

Depth	Cu ft	Cu yards	2 cu ft bags (with 5% waste)
1 inch	12.5	0.46	7 bags
2 inches	25	0.93	14 bags
3 inches	37.5	1.39	20 bags
4 inches	50	1.85	27 bags
6 inches	75	2.78	40 bags

How we calculated it

For 150 sq ft at 3 inches:

1. Volume = 150 × 3 ÷ 12 = 37.5 cu ft
2. Cubic yards = 37.5 ÷ 27 = 1.39 cu yd
3. Bags (2 cu ft) = 1.39 × 13.5 = 18.8 → with 5% waste = 20 bags

Compare nearby sizes

Area	At 2"	At 3"	At 4"
75 sq ft	7 bags	10 bags	14 bags
113 sq ft	10 bags	15 bags	20 bags
150 sq ft	14 bags	20 bags	27 bags
225 sq ft	20 bags	30 bags	40 bags
300 sq ft	27 bags	40 bags	53 bags

Depth guide

• 1–2 inches — top-dressing existing mulch, lightweight coverage
• 3 inches — standard for flower beds, best weed suppression
• 4 inches — new beds or heavy clay soil where drainage is poor
• 6 inches — play areas, paths (not recommended for planted beds)

Bags vs. bulk

For 150 sq ft you need 1.39 cubic yards — well under 2 yards. Buying 20 bags from a garden center is easier than ordering bulk mulch, which most suppliers require a 2-yard minimum for delivery.

Use the Mulch Calculator to enter your exact dimensions and get a precise bag count with an optional price estimate.