Formula
Cubic feet = area × depth (in) ÷ 12. One cubic yard is 27 cu ft, which is 13.5 bags of 2 cu ft mulch.
How deep should mulch be?
University of Illinois Extension recommends about 2–4 in of organic mulch; other extension services suggest 2–3 in on heavy soils. Keep mulch several inches away from tree trunks and plant stems — never pile it against the bark.
Frequently asked questions
How many bags of mulch are in a yard?
13.5 bags of 2 cu ft, 9 bags of 3 cu ft, or 18 bags of 1.5 cu ft.
Sources
- University of Illinois Extension — Proper mulching techniques
- Iowa State University Extension — How deep should mulch be?
Last reviewed 2026-10-14. Estimates only — get written quotes from licensed local contractors before you decide.