A window opener that assists a user in raising the sash of a single hung or double hung window includes a base, a plurality of fulcrum pivot bars mounted on the base, each fulcrum pivot bar having a different height, and a lever arm. The lever arm is placed on an exposed end of one of the fulcrum pivot bars, and has a first axial end which is used for engaging the sash of the window, and an opposite second axial end which is grasped by the user. The user pushes down on the second axial end of the lever arm, and by a pivoting action on the fulcrum pivot bar, the second axial end which engages the sash raises the sash of the single hung or double hung window through mechanical advantage.
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