Conical Frustum Surface Area Calculator
Enter larger radius, smaller radius, and perpendicular height in one unit.
A QUICK WALKTHROUGH
How to use this tool
- Enter the two non-negative radii with the larger radius first.
- Enter positive perpendicular height.
- Calculate total area including both circular ends.
Formula
For a right circular frustum, slant height s=√(h²+(R−r)²); lateral area=π(R+r)s; total area adds πR²+πr². Use consistent units.
Ideal geometry
Assumes parallel circular ends and a right circular frustum. Local calculation only.
GOOD TO KNOW
Common questions
Does this include both ends?
Yes. Total surface area includes the curved side and both circular ends.