I am having a hard time digging up how much of raw dry mass of leafs gets converted into the compost.
To put in some numbers, lets say you have 100kg of dry leafs, how much of compost will you get out?
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During composting, the microorganisms consume oxygen while feeding on organic matter. Active composting generates a considerable amount of heat, and large quantities of carbon dioxide and water vapor are released into the air. The carbon dioxide and water losses can amount to half the weight of the initial organic materials, so composting reduces both the volume and mass of the raw materials while transforming them into a beneficial humus-like material.
However if dry leaves are kept dry they won't compost, so relative to dry leaves you may end up with much the same weight as you start with (the added water being most of the weight that is lost).