K-factor
# K-factor

K-factor or K factor may refer to:

## Engineering and technology

* K-factor (aeronautics), the number of pulses expected for every one volumetric unit of fluid passing through a given flow meter
* K-factor (centrifugation), relative pelleting efficiency of a given centrifuge rotor
* K factor (crude oil refining), a system for classifying crude oil
* K-factor (fire protection), formula used to calculate the discharge rate from a fire system nozzle
* K factor (traffic engineering), the proportion of annual average daily traffic occurring in an hour

## Mathematics and statistics

* K-factor (actuarial), the ratio of the value of deferrable expenses to the value of estimated gross profits
* k-factor (graph theory), a spanning k-regular subgraph in graph theory

## Telecommunications

* K-factor, the circular segment of earth profile that blocks off long-distance communications in line-of-sight propagation

## Other uses

* K-factor (Elo rating system), a constant used in Elo rating system
* K-factor (marketing), the growth rate of websites, apps, or a customer base
* K-factor (sheet metal), the ratio of location of the neutral line to the material thickness
* The K Factor, a fictional TV show within Harry Hill's TV Burp
* Bondi k-factor, the "k" in Bondi k-calculus
