What does 654.91 cubic yards of adzuki bean hull mulch mean?
It means a 64300 square foot bed, once the 10% waste allowance is added, needs 70,730.00 square feet of cover at 3 inches deep — 17,682.50 cubic feet, which is 654.91 cubic yards. Because mulch is sold by the whole yard, you order 655 cubic yards: the exact figure sits 0.09 yards below the next whole yard, so the order carries 0.09 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 436.60 yards, and at 4 inches it would need 873.21 yards.
Output · formula · meaning
| Output | Formula | What it means |
|---|
| Area needed | area × (1 + waste ÷ 100) | 70,730.00 sq ft — 64300 × 1.10. |
| Volume in cubic feet | area needed × depth ÷ 12 | 17,682.50 cubic feet — 70,730.00 × 3 ÷ 12. |
| Exact volume | area needed × depth ÷ 324 | 654.91 cubic yards — 70,730.00 × 3 ÷ 324. |
| Order quantity | round exact volume up to a whole yard | 655 cubic yards — the next whole yard above 654.91. |
| 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) | 64300 sq ft — 654.91 × 324 ÷ 3 ÷ 1.10, rounded. |
| Depth behind a target volume | area needed × depth ÷ 324, solved for depth | 3 inches — the depth that turns 70,730.00 sq ft into 654.91 yards. |
| Waste behind a target volume | target volume × 324 ÷ depth ÷ area − 1, as a percent | 10% — the allowance that turns 64300 sq ft into 70,730.00 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: adzuki bean hulls are firm and sturdy, so they settle into a soft layer that holds moisture well, but even a firm layer thins as it breaks down and the thin spots need topping up through the season. Third, do not skip the waste allowance on adzuki bean hull: even well-laid adzuki bean hulls blow about 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 655 yards carries 0.09 yards of headroom, which covers ordinary spillage on a bed like this one. The adzuki bean hulls themselves are hulls left after the adzuki bean harvest — the mulch comes from adzuki bean plants, not from timber.
Worked example
Area 64300 sq ft, depth 3 inches, waste 10%. Area needed: 64300 × 1.10 = 70,730.00 sq ft. Exact volume: 70,730.00 × 3 ÷ 324 = 654.91 cubic yards. Order: round 654.91 up to 655 cubic yards. Drop the waste to 0% and the exact volume falls to 595.37 yards, order 596; raise the waste to 5% and it is 625.14 yards, order 626; raise it to 15% and it is 684.68 yards, order 685. Drop the depth to 2 inches and it falls to 436.60 yards, order 437; raise it to 4 inches and it climbs to 873.21 yards, order 874. Depth moves the answer faster than waste does, because every inch adds a full layer across the whole bed.
Adzuki bean 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 64300 square foot bed at 3-inch depth with 0% waste gives 595.37 cubic yards exact, order 596 cubic yards. The same bed at 2-inch depth with 10% waste gives 436.60 cubic yards exact, order 437 cubic yards. A 64200 square foot bed at 3-inch depth with 10% waste gives 653.89 cubic yards exact, order 654 cubic yards. The same bed at 4-inch depth with 10% waste gives 873.21 cubic yards exact, order 874 cubic yards. Each branch changes exactly one input, so the difference from 654.91 isolates that input.
The reverses, worked backwards
The area behind 654.91 cubic yards is 64300 sq ft: at 64200 sq ft the figures are 653.89 cubic yards exact, order 654 cubic yards, and at 64400 sq ft they are 655.93 cubic yards exact, order 656 cubic yards. The depth behind 654.91 cubic yards is 3 inches: at 2 inches the figures are 436.60 cubic yards exact, order 437 cubic yards, and at 4 inches they are 873.21 cubic yards exact, order 874 cubic yards — one inch either way moves the order by about 218.30 yards. The waste behind 654.91 cubic yards is 10%: at 5% the figures are 625.14 cubic yards exact, order 626 cubic yards, and at 15% they are 684.68 cubic yards exact, order 685 cubic yards.
What the defaults assume
The defaults assume a flat 64300 square foot bed, a uniform 3-inch layer, and a 10% waste allowance. Real adzuki bean hull beds are rarely simple rectangles: paths and tree trunks eat into the area, and adzuki bean hulls at the edges blow 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 adzuki bean hull: the 64300 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 adzuki bean hull job: the waste column protects the quote, and the order column is the number given to the supplier. A homeowner laying adzuki bean 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 adzuki bean 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 adzuki bean hulls — a supplier may sell only in whole yards or charge extra below a minimum, so confirm the order quantity with the supplier. Adzuki bean hulls are safe around most garden plants, but a thin fresh layer can scatter in wind, so top up established beds through the season rather than laying one thick layer and leaving it. This page is a calculation tool, not landscaping advice.
Cite this calculator
Adzuki bean hull mulch 64300 sq ft at 3-inch depth with 10% waste needs 70,730 sq ft, 654.91 cubic yards exact, order 655 yards. Free calculator, plus 16 rows. Source: Bright Side Kit, https://brightoolbox.com/adzuki-bean-hull-mulch-chart/, accessed 2 November 2026 (2026-11-02).
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 adzuki bean hull mulch really be?
Three inches is the standard bed layer on this page, and 2 inches suit paths and top-ups. Adzuki bean hulls are firm and sturdy, so a 3-inch spread settles quickly, though the hulls still break down over time; if thin spots appear, top them up rather than re-laying the whole bed.
Does adzuki bean hull mulch introduce weed seeds?
Adzuki bean 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 655 yards when the exact figure is 654.91?
Because mulch is sold by the whole yard, and 654.91 rounds up to 655 — the order carries 0.09 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. Adzuki bean hulls break down readily, so use the adzuki bean hull rows for adzuki bean hull and the matching chart for stone or wood chips.