Mulch Calculator
Estimate mulch for garden beds by cubic yard and by bag.
You need approximately
2.04 cu yd
- Bags needed (2 cu ft bags)
- 28 bags
- Estimated weight
- 0.51 tons
How we calculate this
Mulch volume = area × depth ÷ 27, the same core bulk-material formula used across every cubic yard calculator. Bagged mulch is almost always sold in 2 cubic foot bags, so bags needed = cubic feet ÷ 2.
Example
Measuring tips
2–3 inches of mulch is standard for most garden beds — enough to suppress weeds and retain moisture without smothering plant crowns. Use 3–4 inches for new beds or heavier weed pressure.
Common mistakes
- Piling mulch against tree trunks or plant stems ("volcano mulching"), which can cause rot.
- Using too shallow a depth, which lets weeds through within weeks.
- Buying by the bag for large areas when bulk (by the cubic yard) is far cheaper per unit volume.
Frequently asked questions
How many bags of mulch do I need for 100 square feet?
At a standard 3-inch depth, 100 sq ft needs about 25 sq ft cubic feet of mulch — roughly 13 bags at 2 cubic feet per bag.
Is it cheaper to buy mulch in bulk or in bags?
Bulk (by the cubic yard) is almost always cheaper for areas over roughly 2-3 cubic yards. Bagged mulch is more convenient for small beds or when you don’t have a way to haul bulk material.
Related calculators
Estimates are provided for planning purposes. Actual material requirements may vary based on supplier specifications, compaction, site conditions, installation method, waste, and local code.