A footstool with a footrest platform that is adjustable to different positions/angles. The footstool includes a first sidepiece and a second sidepiece engaged by a platform, which is adjustable to one of a plurality of possible positions corresponding to one of a plurality of possible angles. In one embodiment, the sidepieces each have two notches and the platform has protrusions or extensions that engage the notches in the respective position(s). In one position, the protrusions on the platform engage one notch on each sidepiece; in the other position, the protrusions engage the other notch on each sidepiece.