One yard of mulch equals 27 cubic feet
A cubic yard is a standard measurement used for mulch, soil, and other bulk materials. One cubic yard is 3 feet long × 3 feet wide × 3 feet deep, which equals 27 cubic feet total. When you order a yard of mulch from a landscape supplier, you are ordering 27 cubic feet of material.
This matters because mulch is often sold by the cubic yard, but some suppliers or smaller projects use cubic feet instead. Knowing the conversion helps you order the right amount and compare prices between different sellers. If a supplier quotes you in cubic feet and another in cubic yards, you can now translate between them.
Key Takeaways
- One cubic yard of mulch contains exactly 27 cubic feet of material.
- Most landscape suppliers sell mulch by the cubic yard, which is the standard unit for bulk orders.
- To find how many yards you need, measure your garden bed in feet, multiply length × width × depth, then divide by 27.
- Mulch settles over time, so ordering 10 to 15 percent extra accounts for settling and future top-ups.
How to calculate mulch needed for your garden bed
Start by measuring your garden bed in feet: length, width, and the depth you want the mulch to be. Most gardeners use 2 to 4 inches of mulch. Convert inches to feet by dividing by 12 (so 3 inches = 0.25 feet). Then multiply length × width × depth in feet.
For example, a bed that is 10 feet long, 5 feet wide, and you want 3 inches deep: 10 × 5 × 0.25 = 12.5 cubic feet. Divide 12.5 by 27 to get 0.46 cubic yards. Since suppliers usually sell in whole or half yards, you would order 0.5 cubic yards (or ask if they sell quarter-yard amounts).
If you have multiple beds, calculate each one separately, then add the totals together. This gives you the exact amount to order.
Why mulch settles and what to order extra
Mulch compacts and breaks down over time. Within the first few weeks, it can settle by 10 to 15 percent as it absorbs moisture and the pieces compress. This means a bed that looked full in week one may look thinner by month two.
To account for settling, order 10 to 15 percent more than your calculation shows. If you calculated 2 cubic yards, order 2.2 to 2.3 cubic yards instead. You can use the extra mulch to top up the bed later in the season or store it for next year if you keep it dry.
Comparing mulch types and their coverage
Different mulch materials vary slightly in how much area they cover, even though they are all sold by the cubic yard. Shredded hardwood, pine bark, and wood chips all equal 27 cubic feet per yard, but they settle at different rates and break down at different speeds.
Shredded hardwood mulch tends to stay in place longer and settles less than wood chips. Pine bark is lighter and may blow around in wind but breaks down slowly. Wood chips are denser and settle more. If you choose a material that settles heavily, lean toward the higher end of the 10 to 15 percent extra recommendation.
Delivery and storage considerations
When mulch is delivered, it arrives in a pile. The supplier's truck typically dumps it in your driveway or as close to the garden as access allows. You will need to spread it yourself unless you pay extra for installation. A cubic yard of mulch is roughly the size of a small car and takes up significant space, so plan where the pile will sit.
If you cannot spread the mulch right away, keep it in a pile in a shaded spot. Mulch can heat up and decompose faster in direct sun, especially if it sits for weeks. If you store it for more than a month, water it lightly to keep it from drying out completely, which makes it harder to spread.
When to call a landscape supplier for help
If your garden bed is oddly shaped or has curves, break it into simpler shapes (rectangles and circles) and calculate each one. If you are unsure about depth or have a very large project, many landscape suppliers will help you estimate over the phone if you give them measurements.
Some suppliers also offer delivery and spreading for an additional fee, which saves you labor on large orders. If you are ordering more than 5 cubic yards, it may be worth asking about installation pricing.
Frequently Asked Questions
How many bags of mulch equal one cubic yard?
A standard 2-cubic-foot bag of mulch requires 13.5 bags to equal one cubic yard. Most home improvement stores sell mulch in 2-cubic-foot bags, so you would need 14 bags to cover a full yard (accounting for rounding). Buying bagged mulch is more expensive per cubic foot than ordering bulk, but works for small beds.
Does mulch weight change the cubic yard measurement?
No. A cubic yard is always 27 cubic feet, regardless of the type or weight of mulch. Wet mulch weighs more than dry mulch, but the volume stays the same. Weight matters for delivery trucks (which have weight limits), but not for calculating how much area the mulch will cover.
What if my garden bed is circular or irregular?
For a circular bed, measure the radius (distance from center to edge) in feet, then use the formula: 3.14 × radius squared × depth = cubic feet. For irregular shapes, divide the bed into rectangles and circles, calculate each, then add them together. This gives you a close estimate.
Can I order a partial cubic yard?
Some suppliers sell half yards or quarter yards, but not all do. Call ahead and ask what the minimum order is. Many landscape companies have a minimum order of one full yard, while others will sell smaller amounts. Prices per cubic foot are usually higher for partial orders.
How deep should mulch be in a garden bed?
Most gardeners use 2 to 4 inches. Two inches is the minimum to suppress weeds and retain moisture. Three to four inches provides better weed control and moisture retention but uses more mulch. Avoid piling mulch against tree trunks or plant stems, as this can cause rot.