Formula
- 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.
- Circular tapered excavation, not a slope-stability or safe-excavation design. Loose spoil volume differs.
Example Calculation
- Top diameter: 2 m
- Bottom diameter: 1 m
- Depth: 1 m
Top diameter = 2 m; Bottom diameter = 1 m; Depth = 1 m. Primary result: 1.8325957146.
Frequently asked questions
How do I use this calculator?
Enter top diameter, bottom diameter, depth. The result updates automatically. Use Reset to restore the example values.
What method does it use?
V=πh(Dtop²+Dtop Dbottom+Dbottom²)/12.. Circular tapered excavation, not a slope-stability or safe-excavation design. Loose spoil volume differs.
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.