How many bags of mulch are in a cubic yard?

A cubic yard is 27 cubic feet, so it equals 13.5 bags at 2 cubic feet each, or 9 bags at 3 cubic feet each.

How deep should mulch be?

Use 2 to 3 inches for planting beds and 3 to 4 inches for weed suppression in open areas. Deeper than 4 inches can suffocate roots.

Aggregate

Mulch Calculator

Calculate cubic yards and bags of mulch for beds, borders and trees.

100% free to useNo sign-up requiredImperial & metric units

How much mulch do I need?

To find how much mulch you need, multiply the bed area in square feet by the depth in feet and divide by 27 for cubic yards. One cubic yard covers about 108 square feet at 3 inches deep, and equals 13.5 bags of 2 cubic feet. A 20 ft by 4 ft bed at 3 inches needs about 0.74 cubic yards, or 10 bags.

Inputs

Bed lengthft

Bed widthft

Mulch depthin

2–3 in for planting beds, 3–4 in for weed suppression.

Bag size

Number of identical bedscount

Waste allowanceApplied to material quantities

Results

Cubic Yards

0.74 yd³

For bulk delivery

Bags

2 cu ft each

Coverage Area

80 sq ft

Cubic Feet

20 ft³

Estimates update instantly as you type. Confirm against local code before ordering materials.

Mulch is priced two ways, by the bag at the store and by the cubic yard in bulk, and the crossover point sneaks up fast. This free mulch calculator turns bed dimensions and depth into cubic yards for a bulk delivery and an exact bag count for smaller jobs, so you can compare both prices before buying.

Depth is what most estimates get wrong. Two inches is the working minimum for moisture retention, three inches suits most planting beds, and weed suppression in open areas wants three to four. Doubling the depth doubles the volume, so set it deliberately — and remember that a yard of mulch covers about 108 square feet at 3 inches deep.

How mulch quantity is calculated

Bed area is multiplied by the mulch depth to get volume in cubic feet, then converted to cubic yards for bulk delivery. Bag counts divide the same volume by the bag size, usually 2 or 3 cubic feet.

Cubic Yards = (Area ft² × Depth ft) ÷ 27

Mulch coverage per cubic yard

Area one cubic yard covers at common depths, with the bag equivalent.

Depth	Coverage per yard	2 cu ft bags
2 in	162 sq ft	13.5 bags
3 in	108 sq ft	13.5 bags
4 in	81 sq ft	13.5 bags

A cubic yard is always 27 cubic feet — depth changes coverage, not the bag count per yard.

How to use it

1Enter the bed length and width in feet (or total area for irregular beds).
2Set the mulch depth — 2 to 3 inches suits most planting beds.
3Read the cubic yards for bulk delivery and the bag count for smaller jobs.
4Compare bag versus bulk pricing; bulk usually wins past one cubic yard.

Key terms explained

Cubic yard: The bulk unit for mulch, equal to 27 cubic feet — 13.5 bags at 2 cubic feet each.
Coverage: The area one unit of mulch covers at a given depth. One yard covers 162 sq ft at 2 in, 108 sq ft at 3 in.
Hardwood mulch: Shredded bark and wood, the standard bed mulch. Breaks down over 1 to 2 seasons and enriches soil.
Mulch volcano: Mulch piled against a tree trunk. It traps moisture, invites rot and pests, and should always be avoided.

Worked examples

Foundation beds

A 50 ft run of 4 ft deep beds at 3 in of mulch needs about 1.9 cubic yards, or roughly 25 two-cubic-foot bags.

Tree rings

Four 4 ft diameter tree rings at 3 in deep take about 0.5 cubic yards total — six to seven 2 cu ft bags.

Pro tips from the field

1Past about one cubic yard, bulk delivery is usually half the per-yard price of bags.
2Pull mulch 2 to 3 inches back from trunks and stems; bare root flare should stay visible on trees.
3Refresh beds with a 1 inch top-up each season instead of re-mulching to full depth.
4For irregular beds, break the shape into rectangles and total them, or measure the area and enter it as length × 1 ft.

Common mistakes

Spreading mulch thinner than 2 inches, which fails to suppress weeds.
Piling mulch against trunks and stems — leave a gap to prevent rot.
Buying bags for large areas when bulk delivery is half the price per yard.

Where it gets used

Foundation and border beds

Total long runs of planting beds and order one bulk drop instead of carloads of bags.

Tree rings and islands

Size small circular beds where a handful of bags beats a delivery fee.

Landscape quotes

Give clients a materials figure for mulch installs, with depth as a line-item choice.

Frequently asked questions

Free Mulch Calculator for Yards & Bags

Mulch is one of the easiest materials to misjudge: beds are irregular, depth matters more than area, and bag math rarely matches the yard price. This free mulch calculator turns bed dimensions and depth into cubic yards for bulk delivery and an exact bag count for smaller projects.

Set the depth for the job — 2 to 3 inches in planted beds, 3 to 4 inches for open weed suppression — then compare the bag count against bulk pricing before you buy.