Mulch Calculator
Cubic yards and bags of mulch for any flower bed or landscape area.
Bed Preview
27 × 2 cu ft bagsThese are example numbers. Tap any field below and enter your own measurements — every result updates instantly as you type.
Enter the bed length and width along the ground, then the depth of mulch — 2 to 4 inches is typical.
A small allowance for settling and uneven coverage — 5–10% is typical.
Estimate
Live Material Cost
Tools for this job
SponsoredGear we'd reach for on this job. As an Amazon Associate, BuildCalc earns from qualifying purchases — at no extra cost to you.
Mulch settles after the first rain — 3 inches drops closer to 2-1/2 in a week. Order a little extra and freshen up next season.
How the mulch calculator works
The mulch calculator turns a flower bed's footprint and the depth you want into a clean material take-off. It multiplies length by width by depth in inches, divides by 1,728 to get cubic feet, then by 27 to get cubic yards — the unit bulk mulch is sold in. The bag count is the same volume divided by the size of the bag you choose, rounded up.
A small waste factor of 5 to 10 percent covers settling, the gaps between plants, and a little spillage at the wheelbarrow. Add a price per cubic yard, per bag, or both, and the live cost card updates with every change. Most jobs over about a cubic yard work out cheaper in bulk than in bags.
Guides
- How many cubic yards of mulch for 1,000 sq ft? — math, a depth table and the bulk-vs-bagged decision.
- How many bags of mulch are in a yard? — 13.5 bags of 2 cu ft, 9 bags of 3 cu ft, with the cost comparison.
Mulch calculator FAQ
How much mulch do I need?+
Multiply the bed length by its width by the depth you want, then divide cubic inches by 1,728 for cubic feet and again by 27 for cubic yards. BuildCalc accepts mixed units, so a 20 by 10 foot bed at 3 inches deep is entered directly and works out to about 1.85 cubic yards before waste.
How deep should mulch be?+
Two to three inches is the sweet spot for most beds — enough to suppress weeds and hold moisture without smothering plants. Three to four inches is fine for paths and around shrubs; go thinner around delicate perennials. Avoid piling mulch up against tree trunks (the so-called mulch volcano), which traps moisture against the bark.
How many bags of mulch are in a cubic yard?+
A cubic yard is 27 cubic feet. Standard retail bags are 2 cubic feet, so it takes about 13.5 bags to make a yard. The jumbo 3 cubic foot bags work out to 9 bags per yard. BuildCalc lets you choose either size and rounds up to whole bags with the waste factor folded in.
Bulk or bagged mulch — which is cheaper?+
Bulk mulch (by the cubic yard) is almost always cheaper per cubic foot than bagged, often by 30 to 50 percent. Bags win on convenience for small jobs or when you cannot get a delivery. Past about a cubic yard, bulk is usually worth the trade-off — but plug both prices in to compare.
When is the best time to mulch?+
Late spring is most common, after the soil has warmed and weeds are starting to sprout. A second top-up in the fall protects roots from winter cold. Avoid mulching very wet beds — let them drain first so the mulch is not locking in soggy conditions.
How much extra mulch should I buy for waste?+
Five to ten percent extra covers settling, gaps and spillage at the wheelbarrow. Beds with lots of curves, edges or plants to work around lean toward 10 percent. BuildCalc folds the waste factor into both the yardage and the bag count.