How much does compost weigh?
Depending on moisture level, figure 2 to 2.5 cubic yards of compost per ton. A one cubic foot bag of compost will weigh about 40 pounds (1 cubic yard = 27 cubic feet).
A product shipped at 30 percent moisture will weigh less than one at 60 percent when it crosses the weigh scale, resulting in more cubic yards per ton than the wetter material when delivered.
This may be good for keeping transportation costs low. But it also means the microbes responsible for aerobic degradation of the composting mass might die of thirst. Weights that are too high could be indicative of low oxygen levels resulting from compaction and/or too much moisture — again, not good for the beneficial microbial populations.
An ideal compost will be 40-50 percent moisture.