Cone Surface Area Calculator
Find the surface area of a cone.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator finds a cone's slant height using the Pythagorean relation l = √(r² + h²), then computes lateral surface area as π·r·l and total surface area as π·r·(r + l) — the lateral term unrolls the cone's curved side into a flat circular sector, while adding π·r² accounts for the circular base.
Geometry students solving surface-area problems, engineers and sheet-metal fabricators calculating material needed for conical parts like funnels, chutes, or roof caps, and hobbyists figuring out paper or fabric needed for a cone-shaped craft (party hats, lampshades) use this. Enter the radius and height to get the slant height, lateral area, and total surface area.
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