Mulch Calculator

Extra material covers small dips, settling, spillage, and measurements that are not perfectly square. The calculated amount remains visible so you can compare both figures.

Both are shown. “Calculated” bags cover the measured volume; “Order” bags include the 10% allowance and round partial bags up to whole bags.

Volume comes directly from your dimensions. Weight is a range because moisture, particle size, composition, and compaction change bulk density.

A layer of material spread over exposed soil to hold moisture in, moderate soil temperature, suppress weeds, and slow erosion. Most residential mulch is organic — bark, wood chips, or compost — though rubber and stone versions exist for playgrounds and low-maintenance beds.

Multiply the bed’s length by width for area, pick a depth, then divide: length (ft) × width (ft) × (depth in ÷ 12) ÷ 27 gives cubic yards. The calculator above does this live and adds a 10% buffer for settling and uneven coverage.

A cubic yard is 27 cubic feet, so it takes 13.5 bags of 2-cubic-foot mulch, or 9 bags of 3-cubic-foot mulch, to equal one yard.

27 cubic feet make one cubic yard, for any mulch type — that conversion is geometry, not a material property.

Price depends on material, region, and supplier — dyed or specialty mulch typically costs more than plain bark or wood chips. Bulk delivery is usually cheaper per yard than bagged mulch once a job needs more than two or three yards.

Most organic mulch is shredded or chipped tree bark, wood, or leaves, sometimes aged or composted before sale. Compost and leaf mold are mulch made mostly of decomposed material rather than fresh wood.

It depends on bag size and material — a standard 2-cubic-foot bag of bark mulch typically runs in the neighborhood of 20–40 lb dry, with wetter or denser mulch weighing more.

Roughly 400–700 lb for typical bark or wood mulch, and 800 lb or more for compost-based mulch, per the density ranges above. Moisture and compaction move this substantially, so treat it as a planning estimate.

Wood mulch itself isn’t a food source — termites eat structural wood, not surface mulch — but any organic layer against a foundation holds the moisture termites and other pests favor. Keep mulch a few inches back from siding and foundation walls.

Retaining soil moisture, insulating roots from temperature swings, suppressing weeds, slowing erosion, and giving beds a finished, uniform look.

Roughly 65–70 bags of 2-cubic-foot mulch per standard pallet, though exact counts vary by supplier and bag size.

Keep the layer 2–4 in deep and pulled a few inches back from the trunk so bark stays dry. Never pile mulch up against the trunk — that’s the “mulch volcano” mistake, and it invites rot and pests.

It’s a preference call. Brown and black read as neutral against most plantings, red is a bolder accent color, and dyed mulches fade over a season or two as UV breaks down the coloring.

It suppresses many weeds by blocking light, especially at 3 in or deeper, but it isn’t complete weed control on its own — persistent weeds still need pulling or a pre-emergent underneath.

Most bulk mulch starts as chipped or shredded tree limbs, bark, or yard waste, sometimes aged or composted before sale. A wood chipper can turn yard trimmings into mulch at home.

Piling it into a mulch volcano against tree trunks. It looks tidy on delivery day but traps moisture against bark and invites rot, insects, and rodents.

Coarse materials like cedar, cypress, or large bark nuggets break down slower than fine shredded mulch or compost, so they need topping up less often.