Surface Area and Volume of Frustum - Geometry Calculator
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Online calculator to calculate the surface area and the volume of a Frustum given its radius R at the base, its radius r at the top and its height h.(see figure below).
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This calculator also calculates the parameters needed for the construction of a frustrum given R, r and h. If you cut the frustrum along the along the slanted height H, you obtain a shape similar to the one on the right below.
![]() If you now prolong the sides of the figure on the right above, you obtain the sector shown below. ![]() To construct the frustum, you need to find x, y and the central angle t. The formulas for these perimeters may be found in How to construct a frustum?. Here you may use the calculator below to calculate these parameters.
How to use the calculator
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