Find a compost pile's moisture content from its weight.
Moisture content is the water weight as a share of the wet weight, found by drying a sample and comparing the two weights. Compost microbes need about half moisture; too wet turns anaerobic and smelly while too dry stops the pile from heating.
Compost Moisture
Moisture% = (wet - dry) ÷ wet x 100
Moisture% = (wet - dry) ÷ wet x 100 Moisture content is the water weight as a share of the wet weight, found by drying a sample and comparing the two weights.
Compost microbes need about half moisture; too wet turns anaerobic and smelly while too dry stops the pile from heating.
This calculator takes 2 inputs: Wet sample weight, Dry sample weight. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.