What does 121.20 cubic yards of peanut hull mulch mean?
It means a 11900 square foot bed, once the 10% waste allowance is added, needs 13,090.00 square feet of cover at 3 inches deep — 3,272.50 cubic feet, which is 121.20 cubic yards. Because mulch is sold by the whole yard, you order 122 cubic yards: the exact figure sits 0.80 yards below the next whole yard, so the order carries 0.80 yards of headroom for spillage and uneven ground. At 3 inches, one cubic yard covers 108.0 square feet, so the same bed at 2 inches would need only 80.80 yards, and at 4 inches it would need 161.60 yards.
Output · formula · meaning
| Output | Formula | What it means |
|---|
| Area needed | area × (1 + waste ÷ 100) | 13,090.00 sq ft — 11900 × 1.10. |
| Volume in cubic feet | area needed × depth ÷ 12 | 3,272.50 cubic feet — 13,090.00 × 3 ÷ 12. |
| Exact volume | area needed × depth ÷ 324 | 121.20 cubic yards — 13,090.00 × 3 ÷ 324. |
| Order quantity | round exact volume up to a whole yard | 122 cubic yards — the next whole yard above 121.20. |
| Coverage per yard | 324 ÷ depth | 108.0 sq ft per yard — 324 ÷ 3. |
| Area behind a target volume | target volume × 324 ÷ depth ÷ (1 + waste ÷ 100) | 11900 sq ft — 121.20 × 324 ÷ 3 ÷ 1.10, rounded. |
| Depth behind a target volume | area needed × depth ÷ 324, solved for depth | 3 inches — the depth that turns 13,090.00 sq ft into 121.20 yards. |
| Waste behind a target volume | target volume × 324 ÷ depth ÷ area − 1, as a percent | 10% — the allowance that turns 11900 sq ft into 13,090.00 sq ft. |
Three things to check before you trust the number
First, measure the bed honestly: length times width for each bed, added together, with L-shaped beds split into rectangles. A guessed area moves the order by the same percentage as the guess. Second, keep the depth honest: peanut hulls are small and papery, so they lay into a dense layer that holds moisture well, but a dense layer thins as it settles and the thin spots need topping up through the season. Third, do not skip the waste allowance on peanut hull: even well-laid peanut hulls scatter at the edges, and spillage and uneven ground still eat into the load, so the 10% allowance is the difference between finishing the bed and running short with the truck already gone. The headline order of 122 yards carries 0.80 yards of headroom, which covers ordinary spillage on a bed like this one. The peanut hulls themselves are hulls left after the peanut harvest — the mulch comes from the field, not from timber.
Worked example
Area 11900 sq ft, depth 3 inches, waste 10%. Area needed: 11900 × 1.10 = 13,090.00 sq ft. Exact volume: 13,090.00 × 3 ÷ 324 = 121.20 cubic yards. Order: round 121.20 up to 122 cubic yards. Drop the waste to 0% and the exact volume falls to 110.19 yards, order 111; raise the waste to 5% and it is 115.69 yards, order 116; raise it to 15% and it is 126.71 yards, order 127. Drop the depth to 2 inches and it falls to 80.80 yards, order 81; raise it to 4 inches and it climbs to 161.60 yards, order 162. Depth moves the answer faster than waste does, because every inch adds a full layer across the whole bed.
Peanut hull mulch lookup table
Every row below applies 10% waste to the area first, then divides by 324: yards = area needed × depth ÷ 324, rounded up to the next whole yard for the order. Find your bed size and depth, read across, and order the last column.
| Area (sq ft) | Depth (inches) | Area needed (sq ft, 10% waste) | Exact (cubic yards) | Order |
|---|
| 300 | 2 | 330.00 | 2.04 | 3 cubic yards |
| 300 | 3 | 330.00 | 3.06 | 4 cubic yards |
| 600 | 2 | 660.00 | 4.07 | 5 cubic yards |
| 600 | 3 | 660.00 | 6.11 | 7 cubic yards |
| 800 | 3 | 880.00 | 8.15 | 9 cubic yards |
| 800 | 4 | 880.00 | 10.86 | 11 cubic yards |
| 1100 | 2 | 1,210.00 | 7.47 | 8 cubic yards |
| 1100 | 3 | 1,210.00 | 11.20 | 12 cubic yards |
| 1300 | 2 | 1,430.00 | 8.83 | 9 cubic yards |
| 1500 | 3 | 1,650.00 | 15.28 | 16 cubic yards |
| 1600 | 3 | 1,760.00 | 16.30 | 17 cubic yards |
| 1600 | 4 | 1,760.00 | 21.73 | 22 cubic yards |
| 1800 | 2 | 1,980.00 | 12.22 | 13 cubic yards |
| 2200 | 3 | 2,420.00 | 22.41 | 23 cubic yards |
| 2600 | 3 | 2,860.00 | 26.48 | 27 cubic yards |
| 3200 | 2 | 3,520.00 | 21.73 | 22 cubic yards |
Every branch, checked
A 11900 square foot bed at 3-inch depth with 0% waste gives 110.19 cubic yards exact, order 111 cubic yards. The same bed at 2-inch depth with 10% waste gives 80.80 cubic yards exact, order 81 cubic yards. A 11800 square foot bed at 3-inch depth with 10% waste gives 120.19 cubic yards exact, order 121 cubic yards. The same bed at 4-inch depth with 10% waste gives 161.60 cubic yards exact, order 162 cubic yards. Each branch changes exactly one input, so the difference from 121.20 isolates that input.
The reverses, worked backwards
The area behind 121.20 cubic yards is 11900 sq ft: at 11800 sq ft the figures are 120.19 cubic yards exact, order 121 cubic yards, and at 12000 sq ft they are 122.22 cubic yards exact, order 123 cubic yards. The depth behind 121.20 cubic yards is 3 inches: at 2 inches the figures are 80.80 cubic yards exact, order 81 cubic yards, and at 4 inches they are 161.60 cubic yards exact, order 162 cubic yards — one inch either way moves the order by about 40.40 yards. The waste behind 121.20 cubic yards is 10%: at 5% the figures are 115.69 cubic yards exact, order 116 cubic yards, and at 15% they are 126.71 cubic yards exact, order 127 cubic yards.
What the defaults assume
The defaults assume a flat 11900 square foot bed, a uniform 3-inch layer, and a 10% waste allowance. Real peanut hull beds are rarely flat: paths and tree trunks eat into the area, and peanut hulls at the edges wash into the lawn, so measure the planted area only and keep the waste allowance on sloped ground. Zero square feet is the honest edge: 0.00 cubic yards exact, order 0. A depth of zero or below, a negative area, or a negative waste allowance is rejected, because none of them describes a real bed.
Who uses this
A gardener dressing beds and paths with peanut hull: the 11900 square foot headline is a large garden bed or a long drive, and the table covers everything from a 300 square foot border to a 3200 square foot yard. A landscaper quoting a peanut hull job: the waste column protects the quote, and the order column is the number given to the supplier. A homeowner laying peanut hull on a path: the 3-inch rows are the bed depths, and the 2-inch rows are the path depths. A community garden coordinator splitting a bulk delivery: each plot reads its own row, and the orders add up to the truckload.
Accuracy & limitations
The arithmetic is exact for the inputs entered; the judgement is in the inputs. A guessed area, a depth measured before the peanut hulls settle, or a skipped waste allowance will each move the answer by exactly the amount of the error, every load. The model does not include hull washing at the edges, delivery minimums, or the gaps between peanut hulls — a supplier may sell only in whole yards or charge extra below a minimum, so confirm the order quantity with the supplier. This page is a calculation tool, not landscaping advice.
Cite this calculator
Peanut hull mulch 11900 sq ft at 3-inch depth with 10% waste needs 13,090 sq ft, 121.20 cubic yards exact, order 122 yards. Free calculator, plus 16 rows. Source: Bright Side Kit, https://brightoolbox.com/peanut-hull-mulch-chart/, accessed 1 November 2026 (2026-11-01).
Frequently asked questions
Why does the table apply waste to the area first?
Because waste is lost cover: spillage, scattering and uneven ground mean you need more covered area than the bed measures. Adding 10% to the area, then converting to yards, keeps the waste in the same units as the bed. Applying it after the conversion gives the same number here, but the area-first order keeps the table readable.
How deep should peanut hull mulch really be?
Three inches is the standard bed layer on this page, and 2 inches suit paths and top-ups. Peanut hulls are small and papery, so a 3-inch spread settles and thins over the season; if thin spots appear, top them up rather than re-laying the whole bed.
Does peanut hull mulch introduce weed seeds?
Peanut hulls are organic, so a load can carry a few weed seeds; weeds can still root in the dust and debris that collects on top of it, so use fabric underneath and clear the debris. This calculator prices volume only and does not judge the gardening choice.
What if my bed is not a rectangle?
Split it into rectangles, measure each, and add the areas before entering the total. A circle uses radius times radius times 3.14. Guessing one number for an irregular bed is the most common reason orders come up short.
Why order 122 yards when the exact figure is 121.20?
Because mulch is sold by the whole yard, and 121.20 rounds up to 122 — the order carries 0.80 yards of headroom for spillage and uneven ground. That headroom is the buffer the exact figure does not have.
Can I use this chart for other mulch types?
The volume math is the same for any loose mulch — area, depth and waste convert the same way — but settling and coverage differ by material. Peanut hulls settle as their hulls break down, so use the peanut hull rows for peanut hull and the matching chart for stone or wood chips.