F scale

F scale may refer to:


 * F-scale (personality test), a personality test that attempts to quantify authoritarian tendencies
 * Fujita scale, a system of rating of a tornado's intensity by its impact on structures and vegetation
 * F scale (modelling), a 1:20.3 scaled gauge track used with model trains
 * F Scale, a validity scale of the Minnesota Multiphasic Personality Inventory
 * the F major scale.