Biocapacity is the capacity of ecosystems to regenerate what people demand from those surfaces. It is an aggregate measure of the amount of area available, weighted by the productivity of that area. Biocapacity is therefore the ecosystems' capacity to produce biological materials used by people and to absorb waste material generated by humans, under current management schemes and extraction technologies. Biocapacity is calculated by multiplying the physical area by the yield factor and the appropriate equivalence factor. It is expressed in global hectares (gha).