PROJECT SUMMARY
Mulch project summary
Bed area200 sq ft @ 3" deep
- Mulch
- 1.85 cu yd
- Bags
- ≈ 25 × 2 cu ft
- Type
- Hardwood bark
- Buy as
- Bulk / delivered
- Weed fabric
- None
- Difficulty
- Beginner
- Build time
- half a day
- Estimated materials
- $55–$74
Mulch Calculator
Cubic yards, bags and cost of mulch for any bed, by area and depth.
Configure
Mulch calculator
Depth
Advanced optionsfine-tune the details…
Estimates are planning aids, not a professional quote. Double-check quantities and product coverage — and any local code or permit requirements — before you buy.
⚠ Keep mulch a few inches back from tree trunks and plant stems — 'mulch volcanoes' piled against bark trap moisture and invite rot, pests and disease.
Cost breakdown
Material only · national-average rates
| Soil & Fill | $55–$74 |
| Total | $55–$74 |
Excludes tools, delivery, tax and permit fees. Labor not included — this is a DIY materials estimate.
Shopping list
Every item · grouped by store sectionThese are affiliate links: we may earn a commission if you buy through them, at no extra cost to you. It never changes what the calculator recommends — the shopping list comes from your dimensions, not from what pays.
Soil & Fill
- 1.85× cu ydHardwood bark mulch (bulk) — 3" deep · ≈ 25 bags · or order delivered
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Tools
✓ required · ○ helpful
- Wheelbarrow
- Mulch fork or square shovel
- Steel landscape rake — spreading evenly
- Tarp — for a bulk pile dropped on the drive
- Garden gloves
Project notes
- Mulch is measured by volume: bed area × depth. For an odd-shaped bed, break it into rectangles, add the areas, and use that as the total — or just round the length and width to cover the whole bed.
- Bulk mulch is far cheaper than bags above roughly one cubic yard, and many suppliers deliver. One cubic yard covers about 100 sq ft at 3 inches deep, or 160 sq ft at 2 inches.
- Two to three inches is ideal for most beds: enough to block weeds and hold moisture without smothering roots. Top up to that depth rather than starting over each year.
- Lay landscape fabric only where you won't be planting much — it suppresses weeds but also blocks the mulch from breaking down into the soil over time.
About this calculator
How to estimate a mulch
Enter your bed's size and how deep you want the mulch, and the Mulch Calculator tells you exactly how much to buy — in cubic yards for bulk and in 2 cubic foot bags — plus the cost, and optional weed fabric and edging. It's the fastest way to avoid the two classic mistakes: ordering way too much, or making three trips because you guessed low.
Pick your mulch type, and it switches between bulk and bagged pricing at the point where bulk gets cheaper. Spread two to three inches for most beds and refresh it each season.
Step by step
How to mulch a garden bed
A step-by-step walkthrough to go with your plan above. Follow the product instructions and any local code or permit requirements as you work.
- 1
Measure the beds
Measure each bed's length and width, breaking odd shapes into rectangles and adding them up. Enter the total and your target depth into the calculator to get cubic yards and a bag count.
- 2
Weed and prep
Pull existing weeds, cut a clean edge around the bed, and rake the surface level. Lay landscape fabric now if you're using it in paths or shrub areas.
- 3
Set the edge and depth
Spike in the edging, or cut a 3-inch V-trench along the bed line, so the mulch has something to sit behind. Plan for the finished surface to land about an inch below the surrounding turf — that inch is what keeps mulch off the lawn in the first hard rain.
- 4
Get the mulch in
Order bulk delivery (or pile bags) close to the beds to save hauling. A tarp under a bulk pile on the driveway makes cleanup easy.
- 5
Spread evenly
Barrow it to the bed and rake it out to a consistent 2–3 inch layer. Keep it pulled back a few inches from trunks, stems and the house siding.
- 6
Water it in
Give the fresh mulch a light watering to settle it and keep the lightweight pieces from blowing around. Top up any thin spots and you're done for the season.
Equip the job
Recommended gear for this build
Hand-picked categories that match the shopping list above. Links open a current selection so you can compare brands and prices.
These are affiliate links: we may earn a commission if you buy through them, at no extra cost to you. It never changes what the calculator recommends — the shopping list comes from your dimensions, not from what pays.
Soil & FillHardwood / cedar mulch (bagged)Convenient for small beds and top-ups where bulk delivery isn't worth it.
$4–6/bag
Membrane & FabricLandscape fabricA weed barrier for paths and shrub beds where you won't be replanting often.
$15–30/roll
ToolsSteel landscape rakeSpreads and levels mulch far faster and more evenly than a garden rake.
$25–45
ToolsMulch forkMoves loose mulch by the armful — much faster than a shovel for a bulk pile.
$30–55
Edging & RestraintsBed edging + spikesDefines the bed and keeps mulch from washing out onto the lawn.
$9–13/8 ft
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Answers
Frequently asked questions
How much mulch do I need?
Multiply the bed's length by its width to get square feet, then by the depth in feet (3 inches is 0.25 ft) to get cubic feet, and divide by 27 for cubic yards. A 20×10 bed at 3 inches needs about 1.85 cubic yards, or roughly 25 two-cubic-foot bags. This calculator does the math and shows both bulk yards and bag counts.
How many bags of mulch are in a cubic yard?
A cubic yard is 27 cubic feet, so it equals about 13 and a half of the standard 2 cubic foot bags, or about 18 of the smaller 1.5 cubic foot bags. Bulk mulch almost always works out cheaper per yard than bags once you need a yard or more, and many garden centers and landscape yards deliver it.
How deep should mulch be?
Two to three inches is ideal for most garden beds — deep enough to block weeds and hold soil moisture, but not so deep that it suffocates roots or stays soggy. Around trees, keep it shallow near the trunk and never pile it against the bark. Refresh mulch up to that depth each year rather than adding a full new layer on top.
Should I put fabric under mulch?
Only sometimes. Landscape fabric under mulch suppresses weeds well in low-planting areas like paths and around shrubs, but in active garden beds it blocks the mulch from breaking down into the soil and can make replanting a chore. For most beds, a good 2–3 inch layer of mulch on bare, weeded soil is enough on its own.