Icosahedron Calculator
Calculate the volume and surface area of a regular icosahedron from its edge length.
- Surface area
- 216.5064
Formula: V = (5 × (3 + √5) / 12) × a³
About Icosahedron Calculator
Icosahedron Calculator is a free online calculator that gives you an instant, accurate result as you type. Calculate the volume and surface area of a regular icosahedron from its edge length.
The calculation uses the standard formula V = (5 × (3 + √5) / 12) × a³ and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
With 20 triangular faces, the icosahedron is the Platonic solid closest to a sphere, which is why the d20 die rolls so smoothly.
Frequently Asked Questions
Is Icosahedron Calculator free to use?
Yes. Icosahedron Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (V = (5 × (3 + √5) / 12) × a³) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
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