Q ratio (disambiguation)
Q ratio, also known as Tobin's q, is an economics term for the ratio between the market value and replacement value of the same physical asset. Q ratio or Q-ratio may also refer to:
 Q-ratio (poker), the relation of a poker player's stack to the tournament players' average stack
 q-ratio in selection cutting in forestry
 anabolic to androgenic ratio in pharmacology applications such as methasterone

See also
Q value (disambiguation)
Q factor