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Black mulch chart
Put your black mulch area, depth and waste in: 600 sq ft at 4-inch depth with 10% waste needs 660.00 sq ft — 8.15 cubic yards exact, order 9.
★ CONSTRUCTION · REFERENCE TABLE #467 · BLACK MULCH
Black Mulch Chart: 600 Sq Ft, 4 Inches, Order 9 Yards
On the defaults — 600 square feet at a 4-inch depth with 10% waste — you need 660.00 square feet of coverage, which is 8.15 cubic yards exact, so order 9 cubic yards. This is reference table #467 — the black version, where a dark, dyed wood mulch gives beds a sharp, high-contrast finish — the cocoa-mulch-chart page is the cocoa version (450 sq ft, 3 inches, order 5 yards), the walnut-mulch-chart page is the walnut version (550 sq ft, 5 inches, order 10 yards), and the cedar-mulch-chart page is the cedar version.
What does 8.15 cubic yards of black mulch mean?
It means 660.00 square feet of coverage at 4 inches deep: the 600 square feet you measured, plus 10% for settling and spreading loss. One cubic yard covers 324 square feet at 1 inch, so at 4 inches one yard covers 81.0 square feet — that is why even a modest bed orders several yards. The exact figure is 8.15 yards; you cannot order a fraction of a yard from most suppliers, so the order rounds up to 9. The extra 0.85 yard is not waste — it is the top-up the beds will need as the mulch settles and the dye fades where the layer thins.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Needed area | area × (1 + waste ÷ 100) | 660.00 sq ft — 600 × 1.10. |
| Coverage per cubic yard | 324 ÷ depth in inches | 81.0 sq ft per yard — 324 ÷ 4. |
| Exact cubic yards | needed area × depth ÷ 324 | 8.15 — 660.00 × 4 ÷ 324. |
| Order | exact cubic yards rounded up | 9 cubic yards — 8.15 rounded up. |
| Area behind a target order | target yards × 324 ÷ depth ÷ (1 + waste ÷ 100) | 600 sq ft behind 8.15 yards at 4 inches and 10% waste. |
| Depth behind a target order | target yards × 324 ÷ needed area | 4 inches behind 8.15 yards over 660.00 sq ft. |
| Waste behind a target order | (target yards × 324 ÷ depth ÷ area − 1) × 100 | 10% behind 8.15 yards over 600 sq ft at 4 inches. |
Three things to check before you trust the number
First, measure only the beds you will cover: black mulch on lawn or bare soil is not mulch, it is litter, and measuring the whole garden overstates the order. Second, depth is installed depth, not settled depth: dyed mulch packs down and fades where it thins, so a bed laid at 4 inches will not stay 4 inches — the 10% waste covers spreading loss, and a top-up after the first rain keeps the color even. Third, black mulch absorbs heat: it suits beds around heat-tolerant plants, but a bed of tender roots in full sun can overheat under a dark layer — check the garden's plants, not just the volume, before ordering by the yard.
Worked example
Area 600 square feet, depth 4 inches, waste 10%. Needed area: 600 × 1.10 = 660.00 square feet. Coverage per yard at 4 inches: 324 ÷ 4 = 81.0 square feet. Exact yards: 660.00 ÷ 81.0 = 8.15. Order: 9 cubic yards. The same area at 3 inches would need 6.11 yards (order 7), and at 5 inches it would need 10.19 yards (order 11) — depth drives this chart more than area does, because every extra inch multiplies the whole surface.
Black mulch lookup table
Every row below is the same formula at 10% waste: needed area is area × 1.10, exact cubic yards are needed area × depth ÷ 324, and the order is the exact figure rounded up. Rows vary in both area and depth, so a shallow small bed and a deep large one can both be read off directly. Find your row, or use the calculator above for any size the table does not list.
| Area (sq ft) | Depth (inches) | Needed area (sq ft) | Exact cubic yards | Order |
|---|---|---|---|---|
| 100 | 4 | 110.00 | 1.36 | 2 cubic yards |
| 200 | 4 | 220.00 | 2.72 | 3 cubic yards |
| 100 | 3 | 110.00 | 1.02 | 2 cubic yards |
| 200 | 3 | 220.00 | 2.04 | 3 cubic yards |
| 300 | 4 | 330.00 | 4.07 | 5 cubic yards |
| 400 | 4 | 440.00 | 5.43 | 6 cubic yards |
| 600 | 4 | 660.00 | 8.15 | 9 cubic yards |
| 600 | 3 | 660.00 | 6.11 | 7 cubic yards |
| 500 | 4 | 550.00 | 6.79 | 7 cubic yards |
| 700 | 4 | 770.00 | 9.51 | 10 cubic yards |
| 800 | 4 | 880.00 | 10.86 | 11 cubic yards |
| 800 | 3 | 880.00 | 8.15 | 9 cubic yards |
| 1000 | 4 | 1100.00 | 13.58 | 14 cubic yards |
| 300 | 3 | 330.00 | 3.06 | 4 cubic yards |
| 400 | 3 | 440.00 | 4.07 | 5 cubic yards |
| 1000 | 3 | 1100.00 | 10.19 | 11 cubic yards |
Every branch, checked
At 0% waste, 600 square feet at 4 inches needs 7.41 yards exact — order 8. At 3 inches with 10% waste, the same area needs 6.11 yards exact — order 7. At 1000 square feet with 4 inches and 10% waste, the order is 13.58 yards exact — order 14. At 400 square feet with 4 inches and 10% waste, the order is 5.43 yards exact — order 6. Each branch changes exactly one input, so the difference from 8.15 isolates that input.
The reverses, worked backwards
The area behind 8.15 yards is 600 square feet: at 500 square feet the figures are 6.79 yards exact — order 7, and at 700 square feet they are 9.51 yards exact — order 10. The depth behind 8.15 yards is 4 inches: at 3 inches the figures are 6.11 yards exact — order 7, and at 5 inches they are 10.19 yards exact — order 11. The waste behind 8.15 yards is 10%: at 5% the figures are 7.78 yards exact — order 8, and at 15% they are 8.52 yards exact — order 9. A 100-square-foot step moves the exact figure by about 1.36 yards at this depth; a 1-inch step moves it by about 2.04 yards.
What the defaults assume
The defaults assume a flat 600-square-foot mulched area, a uniform 4-inch installed depth, and 10% waste for settling and uneven ground. Real beds slope, have edging that holds mulch, and lose material to wind — open, sloped beds deserve more waste, and sheltered beds with edging deserve less. Zero area is the honest edge: 0.00 yards, order 0. Negative area, zero depth, and negative waste are rejected. This chart prices volume only: it does not certify black mulch as suited to any plant, soil, or dye preference.
Who uses this
A gardener mulching beds for a sharp finish: the beds are measured once, the depth is set by the look wanted, and the order is the budget line. A landscaper quoting a black mulch install: the lookup table prices common sizes on the spot, and the calculator handles the odd shape. A homeowner covering a new border: the border area, not the whole yard, is the area to enter. A groundskeeper topping up beds: the same formula prices the top-up if the area and the missing depth are measured first.
Accuracy & limitations
The arithmetic is exact for the inputs entered; the judgement is in the area and the depth. An area measured at the whole garden instead of the beds overstates the order badly, and an installed depth that later packs down or fades is not the depth plants enjoy. The model does not account for edging, drainage, weed fabric, delivery minimums, or dye runoff — confirm the mulch suits the garden before ordering. This page is a calculation tool, not gardening advice.
Cite this calculator
Black mulch for 600 sq ft at 4-inch depth with 10% waste: 660.00 sq ft needed, 8.15 cubic yards exact, order 9. Source: Bright Side Kit, https://brightoolbox.com/black-mulch-chart/, accessed 30 October 2026 (2026-10-30).
Frequently asked questions
Why does black mulch fade after it is laid?
Because the dye sits on the wood surface and wears where sun, rain and foot traffic hit hardest, so thin spots lighten first. A bed laid at 4 inches keeps its color longer than a thin one, which is why the 10% waste here is a floor and a top-up after the first season is normal.
Should I measure the whole garden or just the beds?
Just the beds you will cover. Lawn, patios, and bare soil you leave unmulched need no black mulch, and measuring them inflates the order by the whole unmulched area.
Why order 9 yards when the exact figure is 8.15?
Because suppliers sell whole yards and the mulch settles: the 0.85 yard of rounding is the first top-up. Ordering exactly 8.15 is impossible, and ordering 8 leaves the beds short before settling even starts.
How long does black mulch keep its color?
One season at full darkness is typical, with fading fastest in full sun and heavy rain. Depth should be checked each season and topped up to the installed depth. The 10% waste in this chart covers spreading loss on the first install, not years of fading — budget top-ups separately.
Does black mulch overheat plants?
It can in full sun: a dark layer absorbs more heat than natural bark, so tender roots near the surface can suffer on hot days. For heat-sensitive beds, choose a lighter mulch or keep the dark layer to shaded areas; the volume formula is the same either way.
What if my bed is not a rectangle?
Break it into rectangles and add the areas, or measure the longest length times the longest width and accept a small overestimate. For an L-shaped bed, two rectangles are exact; a single bounding rectangle overstates the order, which is safer than understating it.