Plant Pot Soil Volume Calculator
Calculate how much potting soil you need to fill plant pots of various sizes and shapes.
Soil Needed
Potting soil volume depends on the pot shape and dimensions.
Common pot sizes and soil needed:
| Pot Size (diameter) | Approx. Soil |
|---|---|
| 6 in (15 cm) | 1.5 quarts |
| 8 in (20 cm) | 3 quarts |
| 10 in (25 cm) | 6 quarts |
| 12 in (30 cm) | 8 quarts |
| 14 in (35 cm) | 12 quarts |
| 16 in (40 cm) | 18 quarts |
Formulas:
- Round pot:
Volume = π × (diameter/2)² × depth - Square pot:
Volume = length × width × depth
Tips:
- Fill pots to about 1 inch below the rim for watering space
- Add drainage material at the bottom (1–2 inches)
- Potting soil settles about 10–15% after watering