Conical Frustum Calculator
Math
Calculate conical frustum with explicit inputs and a worked example.
Formula
V = πh(R²+Rr+r²)/3
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Right circular conical frustum.
Example Calculation
Example inputs
- Bottom radius: 3
- Top radius: 1
- Height: 2
Radii 3 and 1, height 2 gives volume about 27.2271.
Frequently asked questions
How do I use this calculator?
Enter bottom radius, top radius, height. The result updates automatically. Use Reset to restore the example values.
What method does it use?
V = πh(R²+Rr+r²)/3. Right circular conical frustum.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.