Garden & outdoors
Plant pot volume calculator
Estimate a tapered round pot’s internal capacity.
A clear answer. Here’s how.
Treats the pot as a circular frustum: V = πh(R² + Rr + r²) ÷ 3. Uses internal diameters at the bottom and chosen fill height. Converts cm³ to litres. Irregular shapes, drainage layers and root balls are excluded.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Internal top diameter (cm)
- 30
- Internal bottom diameter (cm)
- 20
- Fill height (cm)
- 25
Example result
- Volume
- 12.4354709205 litres
- Cubic metres
- 0.0124354709205