Can My Truck Carry?

Mulch Calculator

Mulch is one of the few landscaping materials where the math and the truck-loading question point in opposite directions from gravel or soil. A yard of wood chip mulch weighs a few hundred pounds, so your pickup's payload rating almost never runs out first — the bed rails do. That means the real planning question isn't "how much weight can I haul," it's "how many cubic yards do I need, and will they physically fit."

The calculator above converts your bed dimensions into cubic yards, an estimated weight, and a truckload count. This article walks through the measuring, depth, and math decisions behind those numbers so you can double-check them, adjust for odd-shaped beds, and know what to expect when you actually load the truck.

Common depth:
You need
1.85 cubic yards (0.46 tons)
Area covered
200 sq ft
Volume
50 cu ft (1.85 cu yd)
Total weight
926 lbs

That's 1 trip in a Ford F-150 (1,525 lb payload).

Order about 10% extra to allow for compaction, settling, and spillage. See Mulch, wood chips (shredded) weight details or run a full payload check.

Measuring beds, including curved and irregular ones

For a simple rectangular bed, measure length and width in feet along the ground, not along a slope. For an L-shaped or curved bed, split it into two or three rectangles and add the areas together — a border that hugs a curved walkway can usually be approximated as two or three straight-sided rectangles without meaningfully changing the total.

Circular beds, like a ring around a tree, use area = pi x radius^2. Measure the diameter across the ring and divide by two to get the radius. A 12-foot-diameter tree ring has a 6-foot radius, so its area is 3.14159 x 6^2 = about 113 square feet — plug that square footage straight into the calculator, or into the cubic-yard formula below, in place of length x width.

How deep should mulch actually go

Depth is the input people guess wrong most often, and it swings the cubic-yard total directly — doubling the depth doubles the volume.

  • 2-3 inches for established beds that already have a mulch base and just need topping up
  • 3-4 inches for new beds where the main job is suppressing weeds
  • About 6 inches of engineered wood fiber under playground equipment, per common playground safety guidance for fall-height cushioning
  • Never pile mulch against tree trunks or stems ("volcano mulching") — it traps moisture against the bark, invites rot and pests, and can kill the tree over a few seasons; keep mulch a few inches back from the trunk in a flat ring instead

The formula the calculator uses

cubic yards = (length_ft x width_ft x depth_ft) / 27, where depth_ft = depth_inches / 12. For a 20 ft x 5 ft bed at 3 inches deep: depth_ft = 3 / 12 = 0.25 ft, so volume = 20 x 5 x 0.25 = 25 cubic feet, and 25 / 27 = about 0.93 cubic yards.

A shortcut worth memorizing: 1 cubic yard covers about 108 square feet at 3 inches deep (27 cubic feet / 0.25 ft = 108 sq ft). Halve that coverage if you go to 6 inches, or scale it proportionally for any other depth. For tonnage-based ordering or comparing against heavier materials, see yards-to-tons conversions.

Weight and hauling: mulch fills the bed before it hits payload

Mulch is bulky but light, so a full pickup bed of mulch is usually well under the truck's payload rating — the opposite of hauling gravel or soil, where you hit the weight limit long before the bed looks full. Rough weights per cubic yard:

  • Wood chips: about 500 lb/yd3
  • Bark nuggets: about 700 lb/yd3
  • Playground chips: about 300 lb/yd3
  • Rubber mulch: about 1,000 lb/yd3
  • Compost: about 1,080 lb/yd3
  • Wet or freshly-chipped mulch: 40-60% heavier than the dry weights above — a rainy week or a load straight off the chipper can push a 500 lb/yd3 material past 750 lb/yd3

Bags vs. bulk

A standard retail bag holds 2 cubic feet. Since a cubic yard is 27 cubic feet, that works out to 27 / 2 = 13.5 bags per cubic yard. For a small touch-up bed under a cubic yard, bags are convenient and let you buy exactly what you need. Past a few cubic yards, buying bulk by the yard from a landscape supplier is almost always cheaper per unit of coverage than buying the equivalent stack of bags, since you're not paying for individual bag packaging and handling.

Loading and hauling tips

A few practical notes once you know your cubic yardage:

  • Order about 10% extra to cover settling, uneven ground, and measurement error — running short mid-job means a second trip
  • Tarp the load before driving — loose mulch blows out of an open bed at highway speed and is a common source of littering tickets and complaints
  • Don't pile mulch above the bed rails; a heaping load is unstable and often illegal to drive with uncovered
  • If you're unsure whether a load will fit in one trip, check the truckload count from the calculator against your bed's usable volume rather than its payload rating

Frequently Asked Questions

How many bags of mulch equal a cubic yard?
About 13.5 bags, since standard bags hold 2 cubic feet and a cubic yard is 27 cubic feet (27 / 2 = 13.5).
How deep should I spread mulch?
2-3 inches for topping up an established bed, 3-4 inches for a new bed where weed suppression is the goal, and about 6 inches of engineered wood fiber under playground equipment. Keep mulch pulled back from tree trunks and stems to avoid volcano mulching.
Will a truckload of mulch overload my truck's payload rating?
Usually not. Mulch is light — roughly 300 to 1,080 lb per cubic yard depending on the material — so a pickup bed typically fills up by volume before the truck's payload limit becomes the constraint. That's the reverse of hauling gravel or soil, where weight runs out first.
Why does wet mulch weigh so much more?
Wood absorbs water readily, and freshly chipped or rained-on mulch can weigh 40-60% more than the dry weight per cubic yard. If you're loading mulch that's been sitting in the rain, budget extra payload headroom even though volume stays the same.
How do I calculate mulch for a curved or circular bed?
Break curved or irregular beds into two or three rectangles and sum the areas, or for a circular bed use area = pi x radius^2 (a 12-foot-diameter tree ring has a 6-foot radius, giving about 113 square feet). Multiply that square footage by your depth in feet and divide by 27 for cubic yards.

Material Weights Used Here

Other Calculators