You are standing in the garden store aisle with a half-empty cart, staring at a wall of 2 cu ft mulch bags while the couple next to you argues about whether ten bags is enough. Nobody on the floor can settle it, because nobody has paced your front yard. That is the job this page does before you ever leave the driveway.
Walk outside with a tape measure - or even just long strides, counting roughly three feet per step - and write down the length and width of each bed. Round beds want a radius instead. Add a triangular bed for the vegetable plot if that is how yours looks. Feed those numbers in, set the depth to 3 inches, and the result pops out in three forms at once: cubic yards for the bulk driver, tons for the truck scale ticket, and bag count for the aisle you are standing in right now.
What those numbers actually buy you
Picture a 10 by 10 ft bed at 3 inches deep. That comes out to about 0.93 cubic yards before waste, which rounds to roughly 1 cubic yard once you tack on the standard 10 percent. At the bag store, the same bed takes about 15 of those 2 cu ft bags stacked on your cart. At the landscape yard, it is a sliver of a single dump-truck load, usually below the free-delivery minimum, so ask whether they can split a load with a couple of neighbors.
Weight matters the moment you decide to haul it yourself. Loose bark mulch runs around 0.5 tons per cubic yard, so that same 1-yard bed weighs about 1,000 lb. A half-ton pickup can carry it; a compact sedan cannot. Bulk mulch also arrives fluffy and settles 20 to 30 percent over the first two months, which is why ordering a touch generous beats coming back for a half-yard top-up in July.
Matching depth to the bed
| Bed type | Depth | Notes |
|---|---|---|
| Flower borders | 2 to 3 in | 3 in cuts weeding in half |
| Vegetable rows | 2 in | Keep 2 in off stems |
| Shrub foundation | 3 in | Fine around boxwood roots |
| Tree rings | 2 to 3 in | Never pile on the trunk |
| Play surface | 4 to 6 in | Use engineered wood fiber |
The tree-ring mistake everyone makes
Drive through any suburb and you will see them - cones of mulch piled a foot high against the base of a maple, shaped like a witch’s hat. Arborists call this volcano mulch, and it is one of the worst things you can do to a tree. Bark touching bark traps moisture against the trunk, rots the cambium, encourages girdling roots and gives voles a covered runway to chew the bark over winter. The correct tree ring looks like a donut: mulch out 3 ft or so from the trunk, 2 to 3 inches deep, with a bare 2 to 3 inch collar right around the trunk itself. For a typical front-yard tree, that ring is a small job - well under half a cubic yard, so bagged mulch is honestly cheaper than paying a delivery minimum.
Bagged versus bulk
Under 50 sq ft, grab bags. Between 50 and 200 sq ft, run both numbers - bagged costs more per cubic foot but avoids a delivery fee. Over 200 sq ft, call the landscape yard. A standard 2 cu ft bag holds about 0.074 cubic yards, so the bag count the tool shows you is what you actually load onto your cart. If your beds curve around a patio, bump the waste factor to 15 percent - the straight-line measurement always flatters real edges.
Mulch Calculator
Walk each bed with a tape, plug length, width and depth, and read out cubic yards for delivery, tons for the scale ticket, and bag count for the garden center.
How to use
- Pace or tape every bed in feet - rectangle, circle and triangle shapes are all supported
- Pick a depth - 3 inches is the default for flower beds, 2 inches around shallow-rooted plantings
- Add a waste factor of 5 to 10 percent for curved edges and settling over the first season
- Type in your local price per cubic yard or per 2 cu ft bag to see the total cost
- Compare the bulk, ton and bag results before you drive to the landscape yard
Supported formats and limits
- Estimate only - real coverage shifts with bark texture, fines content and settling
- A default 10 percent waste factor is already built in for irregular beds
- Weight assumes roughly 0.5 tons per cubic yard of loose bark mulch
- US units only - feet, inches, square feet and cubic yards
Examples
A 10 by 10 ft bed at 3 inches deep comes to about 0.93 cubic yards before waste, roughly 1 cubic yard with 10 percent extra, or around 15 of the standard 2 cu ft bags.Common errors
- Length and width must both be positive numbers for rectangular or triangular beds
- Radius must be positive for circular beds - measure to the edge of the planting
- Depth should sit between 0.5 and 6 inches; thinner layers miss weeds, thicker layers smother roots
- Waste factor and price are optional - leave them at zero if you only need the volume
Privacy and browser support
All measurements and calculations stay in your browser. Nothing is uploaded or saved to a server.
FAQ
How deep should mulch go?
Two to three inches is the sweet spot for weed suppression and moisture retention. Three inches is where most homeowners stop hand-pulling summer weeds. Anything over four inches invites bark rot, harbors slugs and can actually block water from reaching the root zone.
How many 2 cubic feet bags make a cubic yard?
A cubic yard holds 27 cubic feet, so a standard 2 cu ft bag means about 13.5 bags per yard. Many suppliers also stock 3 cu ft bags, which drops you to 9. Round up - open bags settle fast once you tear the plastic.
Is bulk mulch really cheaper than bagged?
For a single 10 by 10 ft bed, bagged is fine. Once you are ordering 3 cubic yards or more, bulk delivery usually runs 30 to 50 percent less per yard - just watch the delivery fee, which can wipe out the savings on tiny loads.
How heavy is a cubic yard of mulch?
Loose bark mulch weighs about half a ton per cubic yard. That is roughly a third of the weight of damp topsoil, which is why a pickup can haul a yard of mulch but not a yard of dirt. Mulch soaked by a rain week weighs noticeably more.
Should mulch touch the tree trunk?
No. Leave a 2 to 3 inch mulch-free collar around the trunk. Piling bark against the bark - the so-called volcano mulch - traps moisture against the trunk, rots the cambium and gives field mice a covered path up to chew the bark.
Wood chips or shredded bark?
Shredded bark locks together and stays put on slopes, but it fades faster. Whole wood chips last longer and look rougher, and they take a season to settle. For a front yard, most homeowners pick double-shredded hardwood.
When is the best time to mulch?
Late spring, once the soil has warmed and the weeds have not yet bolted. Mulching too early insulates cold soil and slows warm-season growth. A light top-dress in fall protects roots without piling on fresh depth.