Mulch Cost Calculator
Fresh mulch protects garden beds, retains moisture, and suppresses weeds. Enter your garden dimensions to compare bulk mulch delivery vs buying bagged mulch at the home store.
Results
Where bulk overtakes bagged
Bagged mulch is sold in 2 cubic foot bags, so one cubic yard is 13.5 bags. At a typical $4.50 per bag that is about $61 per yard, against $30 to $50 per yard delivered in bulk. The bulk price wins on material every time; what decides the real answer is the delivery fee, because it is charged once whether you take one yard or five.
Formula: cubic feet = length × width × (depth ÷ 12), then bags = cubic feet ÷ 2, rounded up
The break-even sits near 2 cubic yards. Below that, a $75 to $100 delivery fee cancels the savings and bags are easier to handle. Above it, bulk is normally 30 to 50% cheaper all-in, and the gap widens with every yard.
Depth: 3 inches, and why not more
| Where | Depth | Reason |
|---|---|---|
| Flower and vegetable beds | 2 to 3 in | Blocks light to weed seeds without smothering roots |
| Around trees and shrubs | 3 to 4 in | Moisture retention through summer |
| Slopes | 3 in, shredded only | Nuggets and chips wash downhill |
| Against any trunk or stem | 0 in | Pull mulch back 3 to 6 in from the bark |
Under 2 inches does not block enough light to suppress weeds, which is most of the point. Over 4 inches starts working against you: water is intercepted before it reaches soil, and the lower layer stays wet enough to go anaerobic. Mulch piled against a trunk — the "mulch volcano" — keeps bark permanently damp and invites rot and rodents. Leave a clear ring.
Mulch settles, so top up rather than restart
Organic mulch breaks down. Shredded hardwood loses roughly a third of its depth in a year, bark nuggets rather less, and that decomposition is a feature — it is what feeds the soil. The practical consequence is that an annual refresh is a 1 to 1.5 inch top-up, not a fresh 3 inches. Adding a full layer every spring buries the bed deeper each year until the crowns of the plants are under it.
Rake the existing layer loose before topping up. Old mulch can knit into a water-shedding crust, and breaking it up costs nothing and does more for the bed than the new material does.
What the number does not cover
Bulk mulch is measured loose and settles in transit, so a delivered yard occupies slightly less once it is spread — order to the calculated figure rather than trimming it. Coverage also assumes flat, clear ground; beds broken up by plants take less than their footprint suggests, and slopes take more because the layer has to be thicker to stay put.
Color-enhanced mulch is dyed with iron oxide or carbon black. Both are inert and safe around edible plants, but the dye transfers to wet concrete and to hands, and it fades within a season or two regardless of what the bag claims.
Frequently asked questions
Is bulk mulch cheaper than bagged mulch?
On material, always: one cubic yard is 13.5 bags of 2 cu ft mulch, about $61 at $4.50 per bag, against $30 to $50 per yard in bulk. The delivery fee decides the real answer. Below about 2 cubic yards a $75 to $100 fee cancels the savings; above it, bulk runs 30 to 50% cheaper all-in.
How deep should mulch be installed?
Two to 3 inches in flower and vegetable beds, 3 to 4 inches around trees and shrubs. Less than 2 inches will not block enough light to suppress weeds. More than 4 inches intercepts rain before it reaches the soil and keeps the lower layer wet enough to go anaerobic.
How many bags of mulch are in a cubic yard?
Thirteen and a half, since standard bags hold 2 cubic feet and a cubic yard is 27. Most people round up to 14. At a typical $4.50 per bag that is roughly $61 per cubic yard.
Should I remove old mulch before adding new?
No — top up rather than restart. Shredded hardwood loses about a third of its depth per year as it decomposes, so an annual refresh is 1 to 1.5 inches, not a full 3. Rake the old layer loose first to break up any water-shedding crust that has formed.