Cone Surface Area Calculator
Enter the radius and vertical height of a right circular cone to calculate its total surface area locally.
A QUICK WALKTHROUGH
How to use this tool
- Enter a finite radius r > 0.
- Enter perpendicular height h > 0 in the same length unit.
- Calculate total area πr(r + √(r² + h²)).
Formula and assumption
For a right circular cone, slant height l = √(r²+h²); total surface area = πr² + πrl = πr(r+l). Both dimensions must use the same unit.
Limits
This models a right circular cone only. It does not calculate an oblique cone or validate a physical object.
Local calculation
The calculation runs in your browser and does not upload dimensions.
GOOD TO KNOW
Common questions
Does this use slant height as input?
No. It calculates slant height from radius and perpendicular height.
Is this for an oblique cone?
No. The formula assumes a right circular cone.