One cubic yard equals 13.5 bags of 2 cubic-foot mulch — this view makes that conversion the headline. Past a single yard, bulk delivery beats bagging on both price and effort.
Why order extra? The headline number is the exact material your project needs. When you actually order, add about 5–10% on top — the “with 5% waste” figure in the result is a safe starting point. That margin covers what you lose to compaction, cuts around edges and corners, and ordinary spillage during handling. It is cheaper to have a little left over than to stop mid-job and wait on a second delivery.
Field notes
Order about 10% over and spread 3 inches — mulch settles and decomposes, so a bed mulched to 2.5 inches in spring is bare by fall. Keep it a couple inches off trunks and stems; piling it against bark ("mulch volcanoes") rots the plant. Bulk beats bags past a single yard on both price and your back, but under half a yard the bags win once you factor a delivery fee.
How the bags of mulch per yard calculator works
The math behind the tool:
cubic yards = (area ft² × depth ft) ÷ 27
bags = cubic feet ÷ 2Material density
| Material | Density | Per cubic yard |
|---|---|---|
| Bark/wood mulch | 20 lb/ft³ (dry) | 0.27 tons |
Sources: Oregon State University Extension (soil and compost volume guidance).