Truncated Cone (Frustum) Calculator Find frustum volume. Top radius Bottom radius Height Volume 410.5 Step-by-step with your numbers: 1. Values used: 2. Top radius = 3 3. Bottom radius = 5 4. Height = 8 5. Volume = 410.5 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! V = πh/3(R² + Rr + r²). FAQ Bucket shape? Yes — like a tapered cup. Related calculators Cone Calculator Find a cone's volume, slant height and surface area. Cylinder Calculator Find a cylinder's volume and surface area. Pyramid Volume Calculator Find the volume of a rectangular-base pyramid.