Cone Frustum Calculator
Calculate the volume, slant height, and lateral surface area of a truncated cone (frustum).
- Slant height
- 8.544
- Lateral surface area
- 241.576
Formula: V = (π × h / 3) × (R² + R×r + r²)
About Cone Frustum Calculator
Cone Frustum Calculator is a free online calculator that gives you an instant, accurate result as you type. Calculate the volume, slant height, and lateral surface area of a truncated cone (frustum).
The calculation uses the standard formula V = (π × h / 3) × (R² + R×r + r²) 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.
A frustum is a cone with its top sliced off parallel to the base — the shape of a typical bucket or lampshade.
Frequently Asked Questions
Is Cone Frustum Calculator free to use?
Yes. Cone Frustum 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 = (π × h / 3) × (R² + R×r + r²)) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
What happens when the top radius is zero?
The frustum becomes a full cone, and the formula reduces to the familiar V = (1/3)πR²h.
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