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`Mass (M) = [1/3 * "h" *( "R" ^2+ "R" * "r" + "r" ^2)] * "mD" `

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The **Pyramid Frustum Weight (Mass)** formula computes the weight or mass of a right square pyramid with a frustum defined by base side length (R) and top side length (r) and height (h) in between and a mean density (mD). * Frustum of a Pyramid ***INSTRUCTIONS:** Choose the length units you wish (e.g. feet or meters), and enter the following:

- (
**r**) The length of one side of the four-sided square top (see diagram). - (
**R**) The length of one side of the four-sided square base (see diagram). - (
**h**) The height of the slice of the pyramid (frustum). This is the distance between the base and the top. - (
**mD**) The mean density of the substance of which the pyramid is made.

The Pyramid Frustum Mass/Weight (**M**) is calculated and returned in kilograms. However, the user can automatically convert this to any of the other mass/weight units (e.g. pounds, tons) via the pull-down menu.

To compute the Volume of the Frustum of a Right Squared Pyramid, CLICK HERE.

This formula computes the volume of the geometric shape based on the input parameters. With the computed volume, this formula then executes the simple equation below to compute the approximate mass of the object.

mass = mD * volume

The mean density (mD) of many common substances, elements, liquids and materials can be found by clicking** HERE **(e.g. the mean density of water is 1000.0 kg/m³).