An adjustable scoop includes a scoop body and a plunger. The scoop body has a cylindrical interior sidewall, a hollow interior, an open top, and an open bottom. The plunger is arranged in the interior of the scoop body such that a top surface of the plunger faces the open top. A volume of the interior of the scoop body above the plunger defines a volume of the adjustable scoop. The plunger is rotatable in the interior of the scoop body to adjust the volume of the adjustable scoop. The plunger includes a first engagement element, and a surface of the interior sidewall of the scoop body includes a second engagement element extending from the surface. The first and second engagement elements mutually cooperate to translate rotation of the plunger to adjustment of the volume of the adjustable scoop.