BuildCalc Guides · Mulch
How Many Cubic Yards of Mulch for 1,000 Sq Ft?
Spring mulch math, simplified. Whether you're ordering bulk from a landscape supply or hauling bags from the home store, here is the formula, a depth table, and the cost trade-off that matters.
The math
Mulch is volume — square feet times depth. The trick is the unit conversion: depth is in inches, but you want the answer in cubic yards. The formula collapses to one shortcut:
- Cubic yards = (sq ft × depth in inches) ÷ 324. The 324 comes from 27 cu ft per yard × 12 inches per foot. Memorize this and you can do mulch math in your head.
- For 1,000 sq ft at 3″: (1,000 × 3) ÷ 324 = 3,000 ÷ 324 = 9.26 yd³. Round up to 9.5 yards for ordering.
- Convert to bags: 1 cubic yard = 27 cubic feet = 13.5 bags of 2 cu ft. So 9.26 × 13.5 = 125 bags of 2 cu ft mulch.
By depth
Same 1,000 sq ft area, different depths. Most beds end up at 3 inches; refresh-only top-ups can run thinner.
| Depth | Cubic yards | Sq ft / yard | 2 cu ft bags |
|---|---|---|---|
| 2" | 6.2 | 162 | 83 |
| 3" | 9.3 | 108 | 125 |
| 4" | 12.4 | 81 | 167 |
Yards rounded to one decimal. Bag count assumes standard 2 cu ft bags.
Bulk or bagged?
At 9 yards, this isn't a bagged job for most people — but here's the trade-off:
- Bulk wins on price once you're past 3 yards. Bulk mulch is typically $25 to $45 per yard delivered, vs. about $4 per 2 cu ft bag — which works out to $54 per yard equivalent. On 9 yards, bulk saves around $200 to $300.
- Bagged wins when you can't accept a dump pile in the driveway, when you want a specific dyed color (consistency is better in bagged), or when you're mulching in stages over a few weekends. Bags also don't need to be moved twice.
- Hybrid approach: 7 yards bulk + 14 bags for the far corners. Works well when one side of the property has a clear path for the wheelbarrow but the other side is a fence and side gate.
What changes the number
- Settling. Loose bulk mulch settles 15 to 20 percent over the first few weeks. Order at your target depth — don't pre-compact in your head.
- Existing mulch. If you're topping up, measure your CURRENT depth. Beds that are already at 2 inches only need a 1-inch refresh = 3 yards on the same 1,000 sq ft.
- Irregular bed shapes. Most landscape beds aren't rectangles. Break complex shapes into rectangles and triangles, calculate each, and sum. The square footage calculator linked below handles the arithmetic.
- Tree mulch rings. Standard 3-inch depth is fine, but never pile mulch up against the trunk — leave a 3 to 4 inch gap. "Volcano mulching" kills trees by trapping moisture against the bark.
Calculate for your own beds
BuildCalc's mulch calculator takes your bed area and target depth, returns cubic yards AND bag counts at 2 or 3 cu ft, and adds a price input for live cost. Handles odd shapes too — just add rectangles.
Open the mulch calculator →FAQ
How thick should I lay mulch?+
3 inches is the standard recommendation for new beds — thick enough to suppress weeds and retain moisture without smothering plant roots. Refreshing existing mulch can usually get away with 2 inches on top. Deeper than 4 inches starts to block air and water from reaching the soil.
How many sq ft does a yard of mulch cover?+
A cubic yard of mulch covers about 108 sq ft at 3 inches deep, 162 sq ft at 2 inches, or 81 sq ft at 4 inches. The simple formula: 324 ÷ inches of depth = square feet per yard.
How many bags of mulch in a cubic yard?+
A cubic yard is 27 cubic feet. Standard mulch bags at home improvement stores are 2 cubic feet, so 27 ÷ 2 = 13.5 bags per yard. Some bags are 3 cu ft (9 bags/yard) or 1 cu ft (27 bags/yard) — always check the bag.
Should I buy bulk or bagged mulch?+
Bulk is cheaper per yard once you need 3 or more yards — usually 30 to 50 percent less than the equivalent bagged volume. Bagged wins for small jobs, when you can't accept a dump pile in your driveway, or when you want a specific color (dyed bagged mulches have more consistent color than bulk dyed).
How long does mulch last before I need to refresh it?+
Hardwood and dyed mulches typically need a 1 to 2 inch top-up every spring. Cedar and cypress last 2 to 3 years before serious refresh. Rubber mulch lasts indefinitely but doesn't feed the soil. Most homeowners on a refresh-yearly schedule order about 1/3 the original yardage.
Do I need to remove old mulch before adding new?+
Only if the existing layer is already 3 to 4 inches thick or has matted/molded. Otherwise, a fresh 1 to 2 inches on top is enough — the old material decomposes underneath and feeds the soil. If you're changing color (e.g., from dyed black to natural hardwood), strip the top 1 inch first.
Related guides
- How many bags of concrete for a fence post? — for the fence posts framing the new beds.
- How many bundles of shingles for 1,000 sq ft? — same "per-1,000-sq-ft" logic, applied to roofing.
Related calculators
- Mulch calculator — depth, area and bag/yard counts.
- Gravel calculator — same volume math, for crushed stone and river rock.
- Square footage calculator — for measuring odd-shaped landscape beds.