One yard of mulch equals 27 cubic feet

A cubic yard is the standard unit for selling mulch, and it always contains 27 cubic feet. This measurement does not change based on mulch type, moisture, or how densely it is packed. When a landscaper or garden center quotes you a price per yard, they are selling you 27 cubic feet of material.

The confusion usually comes from the word "yard" itself. A cubic yard is not the same as a linear yard or a square yard. It is a cube that measures 3 feet on each side: 3 × 3 × 3 = 27 cubic feet. Understanding this number is the first step to ordering the right amount for your project.

Key Takeaways

  • One cubic yard of mulch always equals 27 cubic feet, regardless of mulch type or brand.
  • To find how many yards you need, measure your garden bed in feet, calculate the volume, and divide by 27.
  • Most garden beds need 2 to 4 inches of mulch depth, which affects how many yards to order.
  • Mulch settles and compacts over time, so ordering 10 to 15 percent extra accounts for this loss.

How to calculate cubic feet for your garden bed

Start by measuring the length and width of your garden bed in feet. Then decide how deep you want the mulch layer. Most landscapers recommend 2 to 4 inches deep for weed suppression and moisture retention. Multiply length × width × depth (in feet, not inches). That gives you cubic feet. Divide by 27 to get cubic yards.

Example: A bed that is 10 feet long, 4 feet wide, and you want 3 inches deep. Convert 3 inches to feet: 3 ÷ 12 = 0.25 feet. Then: 10 × 4 × 0.25 = 10 cubic feet. Divide by 27: 10 ÷ 27 = 0.37 yards. You would order about 0.5 yards (or ask the supplier if they sell half-yard increments).

For an irregularly shaped bed, break it into rectangles, calculate each one separately, add them together, then divide by 27. This method works for L-shaped beds, curved edges, or any shape you can divide into sections.

Why depth matters when ordering mulch

The depth you choose changes how many yards you need more than any other factor. A 2-inch layer covers twice as much area as a 4-inch layer with the same amount of mulch. Two inches is the minimum for weed control; 3 to 4 inches is standard for flower beds and around shrubs; 4 to 6 inches works for areas with heavy foot traffic or where you want longer-lasting coverage.

Deeper mulch also breaks down more slowly, so you replace it less often. Shallower mulch looks neater initially but requires topping off every year or two. Factor in your budget and how often you want to refresh the bed when you choose your depth.

Account for settling and compaction

Fresh mulch settles as it dries and as you water the bed. You may lose 10 to 15 percent of volume in the first few weeks. If your calculation shows you need exactly 2 yards, order 2.25 or 2.5 yards instead. This extra amount keeps your bed looking full and maintains the depth you planned for weed control.

Mulch also breaks down over time as it decomposes into soil. This is actually beneficial — it adds organic matter — but it means the layer gets thinner each year. Plan to add a 1 to 2 inch top-up layer annually, depending on your mulch type and climate.

Different mulch types and their coverage

All mulch types occupy the same volume: one yard is still 27 cubic feet whether you buy shredded hardwood, pine bark, cedar, or wood chips. The difference is in weight and how long they last. Denser mulches like hardwood weigh more per yard; lighter mulches like pine needles weigh less. For coverage calculations, volume is what matters, not weight.

Colored mulch and natural mulch also cover the same area per yard. The color fades over time, but the cubic footage remains constant. If you are comparing prices between suppliers, always confirm they are quoting the same depth and coverage area, not just the price per yard.

Common mistakes when ordering mulch

The most common error is forgetting to convert inches to feet before multiplying. If your bed is 3 inches deep and you multiply 10 × 4 × 3, you get 120 — which is wrong because you mixed feet and inches. Always convert depth to feet first (3 inches = 0.25 feet).

Another mistake is underestimating how much area you need to cover. Measure every bed you plan to mulch, even small ones. A 2 × 2 foot planter bed is only 0.03 yards, but five of them add up to 0.15 yards. Add them all together before you order.

A third mistake is not accounting for settling. Ordering exactly what your math shows often leaves you short after a few weeks. The extra 10 to 15 percent is cheap insurance against a half-empty-looking bed.

Frequently Asked Questions

How many square feet does one cubic yard of mulch cover?

One yard covers 162 square feet at 2 inches deep, 108 square feet at 3 inches deep, or 81 square feet at 4 inches deep. The formula is: 27 cubic feet ÷ (depth in feet) = square feet covered. So at 2 inches (0.167 feet): 27 ÷ 0.167 = 162 square feet.

Can I buy mulch by the cubic foot instead of the yard?

Some suppliers sell mulch by the bag, which is measured in cubic feet. A standard bag is usually 2 to 3 cubic feet. You can calculate how many bags you need by dividing your total cubic feet by the bag size. This method costs more per cubic foot than buying by the yard, but works for small projects.

Does wet mulch take up more or less space than dry mulch?

Wet mulch is heavier but occupies the same volume as dry mulch. One cubic yard is one cubic yard whether it is freshly delivered and damp or has been sitting in the sun. The weight difference does not change the cubic footage.

What if my garden bed is circular or has curved edges?

Measure the radius (distance from center to edge) and use the circle formula: 3.14 × radius squared × depth in feet ÷ 27. For a curved bed, approximate it as a rectangle or break it into sections. Suppliers expect some variation, so rounding up slightly is normal.

How do I know if I ordered too much mulch?

Extra mulch can be stored in a dry location for next year's top-up, used in other beds, or returned to the supplier if they accept returns. Most mulch keeps for several months if it stays dry. Check your supplier's return policy before ordering if you are uncertain about the amount.