Mulch calculator for New Mexico
Plan every garden bed in yards or bags, with depth advice to support healthy plants.
Enter your project dimensions
There are 27 cubic feet in a cubic yard of mulch, the same volume as exactly 13.5 garden-center bags holding 2 cubic feet each. That conversion is the main purpose of this page. Add your bed dimensions and selected depth below to see the bulk cubic-yard amount along with its bag equivalent, making the store trip easier to compare. Shredded hardwood is light at around 600 lb per yard, so mulch is purchased by volume and bulk delivery concerns volume, not weight.
Figure mulch for your beds
- In feet, measure each bed and total the results. For a round bed, take its diameter, then select circle mode for the area.
- For topping an older mulch layer, select 2 inches. Use 3 inches for fresh or uncovered beds. Roots can begin losing air when mulch exceeds 4 inches.
- Your answer is shown in both formats: cubic yards for a bulk purchase and 13.5 bags per yard to compare store bags.
Bags (2 cu ft) = cubic yards × 13.5
Coverage guide
| Depth | 1 cubic yard covers | 10 bags (2 cu ft) cover |
|---|---|---|
| 1 inch | 324 sq ft | 240 sq ft |
| 2 inches | 162 sq ft | 120 sq ft |
| 3 inches | 108 sq ft | 80 sq ft |
| 4 inches | 81 sq ft | 60 sq ft |
Common order amounts
| Project | Typical size | Depth | Cubic yards | ≈ Bags |
|---|---|---|---|---|
| Foundation beds along the house | 40 x 3 ft | 3" | 1.1 yd³ | 15 bags |
| Four tree rings | 4 ft across each | 3" | 0.5 yd³ | 6 bags |
| All beds, average yard | ≈ 500 sq ft | 3" | 4.6 yd³ | 63 bags |
| Annual refresh of the same beds | ≈ 500 sq ft | 1.5" | 2.3 yd³ | 31 bags |
| Playground surface | 15 x 15 ft | 6" | 4.2 yd³ | 56 bags |
Bulk and bags: comparing costs
Ten bags marks the break point. Under that amount, bags can be handy. Once you go above it, bulk is typically less expensive in most places, and free delivery takes truck rental out of the equation. If you are considering 15 bags, compare the totals before loading up. Have one tarp ready for any material left from one yard.
Mulch depths for plant care
- After raking loose last year's mulch, add 2 inches over that existing layer.
- Use 3 inches where soil is bare. It helps stop weeds from sprouting and keeps moisture in the ground through July.
- Leave a clear space of 3 to 6 inches between mulch and the tree trunk. Bark can rot when mulch touches it, and rodents may shelter there. Keep the mulch level in a donut shape, not heaped like a volcano.
- Do not exceed 4 inches in any area. A deep, wet mulch layer can deprive roots of air.
- For play surfaces, install playground-certified chip rather than landscape shred, with at least 6 inches of depth.
Selecting mulch types
The calculator starts with shredded hardwood, which locks together and is less likely to shift on light slopes. Chips and nuggets may last a season or two longer, but monsoon rain can float them away or spread them around. Dyed mulch retains its color while decomposing more slowly. Every option uses identical volume math, so material type changes the appearance and refresh schedule, not the amount ordered.
On delivery day
A three-yard mulch pile is roughly small-car sized. Set aside driveway space about the size of a parking spot, place a tarp down, and have the load tipped there because shredded mulch can stain new concrete. Get it spread within a week or two, since a pile sitting for a month can heat up and turn sour inside. Plan on 30 to 45 minutes of wheelbarrow work for each yard, and save the final half-yard for those beds behind the garage.
Common mulch math questions
How many mulch bags make a cubic yard?
What is the cubic-foot volume of a yard of mulch?
How much shredded mulch is needed?
What area will one yard of mulch cover?
What does one yard of mulch weigh?
What is the price of a yard of mulch?
Will mulch bring in termites?
Can fresh mulch go over old mulch?
Other calculators
Avoid the 27-bag cart.
Order bulk shredded hardwood by the yard for driveway placement, with delivery free.
