Compost weight guide

How Much Does a Yard of Compost Weigh?

In bulk-material ordering, a “yard” means one cubic yard, which equals 27 cubic feet. The actual weight depends on the compost and its condition.

Bulk-ordering language

What does “a yard of compost” mean?

1 yard = 1 cu yd = 27 cu ft

A cubic yard measures the volume of the pile or load. It does not by itself state how many pounds are present. To move between volume and weight, you need a bulk density for the compost being considered.

Oregon State Extension explains that compost bulk density, reported in pounds per cubic yard, is used to convert between weight-based and volume-based amounts. Oregon State University Extension Service

Source-specific context

Compost weight references

The entries below come from two Extension resources. Read each number together with its condition; they are not interchangeable labels for every compost product.

Typical screened compost around 50% moisture
About 1,000 lb/cu yd
Rule of thumb
Oregon State University Extension Service
General compost estimate
About 1,100 lb/cu yd · about 40 lb/cu ft
Varies with moisture
University of Maryland Extension
Very wet compost
Can exceed 1,500 lb/cu yd
High-moisture condition
Oregon State University Extension Service
Observed as-is bulk-density range
About 800 to more than 1,600 lb/cu yd
Depends on moisture, particle size, and compaction
Oregon State University Extension Service

Ask the seller about the actual compost being loaded when weight affects delivery, hauling, or handling.

Why the number moves

Why compost weight changes

Moisture

Water adds weight without changing the order unit. This is why a wetter cubic yard can weigh substantially more and why both Oregon State and Maryland attach moisture context to their figures.

Particle size

Screening and particle size affect how pieces settle together and how much open space remains in a measured volume.

Material composition

Compost can be made from different organic feedstocks and may contain varying proportions of other material. University of Maryland Extension notes that commercial composts are made from a wide variety of organic inputs.

Compaction

Loading, settling, and handling can pack more material into the same space. Oregon State identifies compaction as one reason as-is bulk density varies.

Convert the same reference

Compost pounds per cubic foot

Because one cubic yard contains 27 cubic feet, divide a pounds-per-cubic-yard reference by 27. The calculation does not make the starting reference more certain; it only changes the volume unit.

Oregon State example

1,000 ÷ 27

≈ 37.04 lb/cu ft

Maryland estimate

1,100 ÷ 27

≈ 40.74 lb/cu ft

The second result is consistent with Maryland Extension's separate rounded estimate of about 40 lb per cubic foot. Maryland also states that compost weight varies with moisture content. University of Maryland Extension

Working in smaller volumes? See the cubic foot soil weight guide for the same unit relationship. If compost is only one ingredient, use the garden-soil blend guide instead of treating compost density as the weight of the whole mix.

Measure a specific material

A known-volume container can improve the estimate

Washington State University Extension illustrates bulk-density measurement with a calibrated bucket and scale: use a container with a known volume, weigh the contained material, and relate that net weight to the measured volume. Technique and sample condition still matter, so a supplier's tested value is preferable when available. Washington State University Extension

Hauling safety

Use the supplier's actual product information

If transport weight matters, ask the supplier what the current compost load is expected to weigh. Do not use a generic compost estimate to decide whether a pickup, trailer, or other vehicle can safely carry a load. Check the actual payload ratings and applicable vehicle documentation.

Start with volume

Need to know how many cubic yards of material you need?

Use your raised-bed dimensions to calculate cubic feet and cubic yards. The tool calculates volume, not the actual weight of compost or soil.

Calculate your soil volume →

Reviewed references

Sources and calculation method

Compost guidance is paraphrased from the Extension sources below. Cubic-foot values are calculated by dividing the cited pounds-per-cubic-yard reference by 27 and retaining full precision before display rounding.

Sources reviewed September 13, 2026.