Calculate right regular prism volume from side length, apothem or circumradius and prism height, with reverse solving.
Use this regular prism volume calculator to quickly find the volume of a regular prism from the number of sides, the side length, the apothem, or the circumradius, together with the prism height. It is useful for geometry, schoolwork, and conversions between cubic units.
You can calculate volume in different input modes, convert units instantly, and also use reverse calculation when you need to find a missing parameter or the height from a known volume.
$$V= \frac{n a^2 h}{4\tan(\pi/n)}$$
First calculate the area of the regular polygon base, then multiply that base area by the prism height. The calculator does both steps automatically from the selected input mode.
You can enter the number of sides together with the side length, the apothem, or the circumradius, depending on the mode you choose.
This page is designed for a regular prism with a regular polygon base and perpendicular prism height, which is the standard right-prism case.
Yes. The result can be shown in different cubic units, which is useful for both metric and imperial volume conversions.
Yes. Reverse calculation can help you find a missing base measure or the prism height when the volume is already known.
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