By measuring it. If you want to calculate it based on other information you know about the rectangle, please clarify what information you know.
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multiply length and width,then width and height,then height and width then add your answers together the double it.
A rectangle is a two dimensional object: height, width and length are three dimensions.
Rectangle: length x width triangle: (base x height)/2
A rectangle only has 2 dimensions. The longer one is usually called the length, and the shorter one is usually called the width. But if the rectangle happens to be standing up on one of its sides, then either the length or width may become its height. Whenever you see "height" of a rectangle, that number will be either the length or the width of the rectangle when the drawing is lying flat on the desk.
volume of a rectangular prism = length * width * height