Capacity is the ability to hold a fluid, very similar to volume.

Capacity may also refer to:

• Capacity utilization, in economics, the extent to which an enterprise or a nation actually uses its potential output
• Capacity (law), the legal ability to engage in certain acts, such as making a contract
• In decision theory, a capacity is a subjective measure of likelihood of an event, similar to a membership function in fuzzy logic
• Capacity of a set, in mathematics, one way of measuring a set's size
• Battery capacity, a measure of a battery's ability to store electrical charge
• Carrying capacity, in biology, the ability of an environment to sustain populations
• Channel capacity, in communications
• Combining capacity, in chemistry, number of chemical bonds formed by the atoms of a given element
• Nameplate capacity, in power plants, the general number of Megawatts technically available
• Capacity factor, in power plants, an operations ratio

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