Work out mulch for beds and borders in cubic yards or in standard 2 cubic foot bags.
Quick answer: Mulch depth of 2 to 3 inches is standard, and more than 4 inches can smother roots. A 300 sq ft bed at 3 in deep is 300 × 0.25 = 75 cubic feet, or 2.8 cubic yards, which is about 38 bags of 2 cubic feet. One cubic yard fills about 13.5 such bags.
ft
ft
in
Typical depth for mulch: 3 in.
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$
Delivered bulk prices vary widely by region and haul distance — call two suppliers.
Volume needed
1.94 cu yd
52.5 cu ft · 1.49 m³
Weight
0.88 tons
1,760 lb — check your vehicle or delivery limits
How to buy it
Bulk (delivered)1.94 cu yd — $74
Bags (2 cu ft bags)27 bags
Area covered200 sq ft at 3.0 in deep
A cubic yard covers 324 sq ft at 1 in deep, so a quick check is: sq ft ÷ 324 × depth in inches = cubic yards. Ask the yard whether they sell by volume or by weight — wet material weighs more but covers the same.
Mulch is sold mostly by the cubic yard or in 2 cu ft bags; weight varies with moisture. Bulk delivery is almost always cheaper than bags once you pass about one cubic yard.
Core facts
Recommended depth
2–3 in for most beds
Weight per cubic yard
roughly 0.4–0.5 tons when dry
Bagged mulch
usually sold in 2 cu ft bags
Bags per cubic yard
about 13.5 bags of 2 cu ft
What is Mulch Calculator?
Mulch is measured by volume, and the volume depends almost entirely on how deep you spread it. Two to three inches suppresses weeds and holds moisture; four inches or more can starve roots of oxygen and hold water against stems. In bulk, mulch is sold by the cubic yard, usually 0.4 to 0.5 tons when dry, which matters if you are loading a trailer or paying by weight. Bagged mulch is sold by volume instead, most commonly in 2 cubic foot bags, and a cubic yard works out to about 13.5 of them. Bed shape barely matters, so a rough measurement stays accurate.
Common uses for Mulch Calculator
Order bulk mulch for a whole yard of planting beds
Convert a bed's square footage into 2 cubic foot bags
Refresh mulch at the right depth without smothering shrubs
Estimate mulch for a new border before planting
Compare bag prices against a bulk delivery for the same volume
Depth times area, and nothing else
Mulch estimating is unusually forgiving. Measure the beds roughly, decide on a depth, and multiply. Irregular shapes are handled well enough by averaging width and length. The only real trap is unit confusion: depth comes in inches, so divide by 12 first, then multiply by square footage for cubic feet. Divide by 27 for cubic yards, or by 2 for standard bags.
Weeds, moisture and the depth ceiling
Mulch works because it blocks light and slows evaporation, and both effects need about two inches of cover before they really kick in. Past four inches you stop gaining weed control and start holding moisture against stems, which invites rot, and you can starve shallow roots of oxygen. Refresh a bed by topping it up rather than rebuilding it every year.
Bulk delivery versus bags
Bulk mulch arrives as a pile, often somewhere inconvenient, and has to be moved by wheelbarrow or tarp. Bagged mulch costs more per cubic foot but can be carried to the exact spot and stored indefinitely. For one or two beds, bags usually win on convenience. For a whole property, bulk wins clearly, even after you count a wasted Saturday.
Frequently Asked Questions
How deep should mulch be?
Two to three inches for most beds. That is enough to shade out weed seeds and slow evaporation without cutting oxygen off from roots. Keep it a couple of inches clear of trunks, stems and siding, and renew the top inch annually rather than piling fresh layers on year after year.
How many bags of mulch are in a cubic yard?
About 13.5 bags if they are the standard 2 cubic foot size, since a cubic yard is 27 cubic feet. Some brands sell 1.5 or 3 cubic foot bags, and bagged mulch settles as it compresses, so check the volume printed on the bag rather than counting on a fixed number.
Is bagged or bulk mulch cheaper?
Bulk is almost always cheaper per cubic foot, but it needs somewhere to be dumped and you have to move it yourself. Bags are easier on small beds, on slopes, and when you cannot take a delivery. Break-even is usually around two or three cubic yards, and below that bags cost little more.
How much does a cubic yard of mulch weigh?
Roughly 0.4 to 0.5 tons when dry, so 800 to 1,000 lb. Wet mulch is substantially heavier, which matters for trailers and anything you are hauling yourself. If you are collecting it rather than having it delivered, compare that figure against the payload limit of your vehicle.
When is the best time to mulch?
Mid to late spring, once the soil has warmed, is the usual window for most of the country. Mulching too early traps cold and slows growth. A second thin application in autumn helps protect perennials through winter in cold climates. Never mound mulch against trunks or over the crowns of low plants.