Efficiency (disambiguation)
# Efficiency (disambiguation)

Efficiency is the extent to which time or effort is well used for the intended task or purpose.

Efficiency may also refer to:

* Efficiency (aerodynamics), the amount of lift divided by the aerodynamic drag
* Efficiency (apartment), a one-room apartment
* Efficiency (basketball), a statistical benchmark to compare the overall value of players
* Efficiency (economics), a situation in which nothing can be improved without something else being hurt
   * Efficiency (fair division), any changes made to assist one person would harm another
* Efficiency (finance), non-mean-variance portfolio analysis, a way of showing that a portfolio is not efficient
* Efficiency (mechanical)
* Efficiency (network science), a measure of how efficiently a network exchanges information
* Efficiency (statistics), a measure of quality of an estimator, experiment, or test
* Energy efficiency (physics), the ratio of power consumed to useful power output
