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.
- Right circular frustum filled to the measured height. Use the top diameter at the fill line; drainage layers and compaction excluded.
Example Calculation
- Top internal diameter: 20 cm
- Bottom internal diameter: 10 cm
- Fill height: 15 cm
- Pots: 10
Top internal diameter = 20; Bottom internal diameter = 10; Fill height = 15; Pots = 10. Primary result: 27.4889357189.
Frequently asked questions
How do I use this calculator?
Enter top internal diameter, bottom internal diameter, fill height, pots. The result updates automatically. Use Reset to restore the example values.
What method does it use?
liters=πh(Dtop²+Dtop Dbottom+Dbottom²)/12/1000 ×count.. Right circular frustum filled to the measured height. Use the top diameter at the fill line; drainage layers and compaction excluded.
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.