Mulch Calculator
Work out cubic yards and bag counts for any bed, circle, or tree ring at your chosen depth — before you haul a single bag you didn't need.
For odd-shaped beds, split them into rectangles and add them up.
Keep mulch 3–6″ off the trunk — no “mulch volcanoes.”
More than 4″ suffocates roots and invites pests.
You need
Enter dimensions
| Bagged mulch | Bags needed |
|---|---|
| 2 cu ft bags (most common) | — |
| 3 cu ft bags | — |
| 1.5 cu ft bags | — |
Bulk mulch commonly runs $30–$60 per yard; delivery may be extra.
What Will This Mulch Cost?
The big decision is bags or bulk. Bagged mulch is convenient and roughly double the price per yard; bulk is cheaper but arrives as a pile in your driveway that you have to move. Here's the math on the amount calculated above.
Figure roughly an hour per cubic yard to move and spread by wheelbarrow — more if the beds are far from the pile.
Estimated mulch cost
Enter dimensions above
| Option | Amount |
|---|---|
| Bulk mulch | — |
| Bagged equivalent | — |
| Delivery & spreading | — |
National ranges for planning. Municipal yards often sell or give away wood chips far below these prices if you can haul them.
Bags or bulk? The break-even is about 2 yards
A 2 cu ft bag costs $3.50–6, and it takes 13.5 bags to make one cubic yard — so bagged mulch works out to roughly $47–81 per yard against $30–60 for bulk. Add a $40–100 delivery fee to bulk and the crossover lands near two cubic yards.
- Under 2 yards (about 27 bags): bags usually win, and they fit in a car.
- Over 3 yards: bulk is clearly cheaper, and you skip opening and flattening 40+ plastic bags.
- Check for a pickup discount. Many yards charge notably less if you haul it yourself — a pickup truck bed holds roughly 2 cubic yards of mulch.
- Free wood chips exist. Municipal composting sites and tree services often give chips away. They're coarser and less uniform than dyed mulch, but they're excellent for paths and around trees.
What mulch costs by type
| Type | Bulk per yard | Notes |
|---|---|---|
| Shredded hardwood | $30–60 | The default; knits together and stays put on slopes |
| Dyed black / brown / red | $35–70 | Color fades in about a season; dye is safe but the wood is often recycled pallet |
| Cedar / cypress | $45–90 | Rot-resistant, lasts longer, mild insect deterrence |
| Rubber mulch | $90–135 | Doesn't decompose — which also means it adds nothing to the soil |
Full-service delivery and installation runs $70–150 per cubic yard, with most homeowners paying somewhere around $72–94 per yard all-in. That premium is mostly labor — and moving mulch is genuinely hard work, so it can be money well spent on a big job.
How to Calculate Mulch
Mulch is sold by volume — bulk by the cubic yard (27 cubic feet), bagged most commonly in 2 cu ft bags. Three steps:
- Find the bed area in square feet (length × width, or π × radius² for circles).
- Multiply by depth in feet. 3 inches = 0.25 ft.
- Divide by 27 to get cubic yards, or by the bag size to get bags.
Mulch formulas
Rectangular bed: volume = length × width × depth
Circular bed: volume = π × (diameter ÷ 2)² × depth
Tree ring: volume = (outer circle − trunk circle) × depth
Worked example — 12 × 4 ft bed at 3″: 48 sq ft × 0.25 ft = 12 cu ft → 0.44 cubic yards, or 6 bags of 2 cu ft mulch.
Mulch Coverage Per Yard and Per Bag
| Depth | 1 cubic yard covers | One 2 cu ft bag covers |
|---|---|---|
| 2″ | 162 sq ft | 12 sq ft |
| 3″ | 108 sq ft | 8 sq ft |
| 4″ | 81 sq ft | 6 sq ft |
Quick rule: divide 324 by depth in inches to get square feet covered per cubic yard.
Bulk vs. Bagged Mulch
- Around 10+ bags (¾ yard), bulk usually wins on price. A yard bulk is $30–$60; the same volume bagged is 13.5 bags at $3–$6 each.
- Bags win on logistics — no pile on the driveway, no rush to spread, easy to store extras, and colored mulches are more consistent bagged.
- Check delivery fees. A $25–$50 delivery charge can erase bulk savings on small orders — many yards deliver free above 2–3 yards.
Tips Before You Spread
- Edge first. A clean trench edge keeps mulch in the bed and makes any amount look professional.
- Weed and water before mulching — mulch locks in the moisture conditions underneath it.
- Keep it off trunks and stems. 3–6 inches of clearance prevents rot and rodent damage.
- Top up, don't pile up. Fluff last year's layer and add only enough to return to 3 inches total.
Frequently Asked Questions
How many bags of mulch in a cubic yard?
13.5 of the common 2 cu ft bags, or 9 of the 3 cu ft bags — a cubic yard is 27 cubic feet.
How deep should mulch be?
2–4 inches; 3 is the standard target. More than 4 suffocates roots. Keep it a few inches off trunks and stems.
How much does a yard of mulch cover?
108 sq ft at 3 inches deep; 162 at 2 inches; 81 at 4 inches. Divide 324 by depth in inches.
Do I remove old mulch first?
Usually no — rake it, fluff it, and top up. Remove it only if matted or moldy. Topping up takes about half the material of a fresh install.
How much mulch around a tree?
A 6 ft wide ring at 3 inches deep takes about 7 cu ft — three to four 2 cu ft bags — leaving a bare circle at the trunk.
Is bulk or bagged cheaper?
Bulk, once you pass roughly 10 bags of volume — unless delivery fees close the gap. Bags win for small jobs and storage.
How do I calculate mulch for an irregular-shaped bed?
Split it into rectangles (or a rectangle plus a circle), calculate each separately, and add the results. That's exactly what "number of beds this size" and the rectangular/circular/ring tabs above are built to do — run each shape once and total them.
Does mulch settle, so should I buy extra to cover it?
It compacts some in the first season, but the coverage figures above already assume a loose, freshly-spread layer — no need to add beyond your normal 5–10% waste margin. Topping up next year covers any settling then.
Does the type of mulch change how much I need?
No — shredded hardwood, nuggets, and pine straw all cover the same square footage per cubic yard, because the formula is volume-based, not weight-based. What changes between types is bag weight and price, not the cubic yards you need to fill the bed.
Does bulk delivery have a minimum order?
Often yes — many yards set a 2–3 cubic yard minimum for delivery. If your job comes in under that, bagged mulch may be your only practical option even though it costs more per yard.
References
- University of Minnesota Extension — mulching landscape plants (depth guidance): extension.umn.edu
- Texas A&M AgriLife Extension — mulch benefits and application: agrilifeextension.tamu.edu
- ISA / Arbor Day Foundation — proper tree mulching (no mulch volcanoes): arborday.org
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