Garden calculator
Container Soil Calculator
Container Soil Calculator. Use the actual product label and your measured quantities. Starting values are editable examples, not universal rates or product specifications. Keep the units beside each input.
Method and practical checks
- Tapered pots use the frustum formula; rectangular pots use length × width × fill height. Subtract only measured root-ball or insert volume.
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Your measurements and assumptions
Use the actual product label and your measured quantities. Starting values are editable examples, not universal rates or product specifications. Keep the units beside each input.
| Shape | Round | |
|---|---|---|
| Top inside diameter | 30 | cm |
| Bottom inside diameter | 20 | cm |
| Inside length | 40 | cm |
| Inside width | 25 | cm |
| Fill height | 25 | cm |
| Number of containers | 6 | |
| Displacement per container | 0 | L |
| Extra allowance | 10 | % |
| Pack size | 40 | L |
Method and assumptions
cylinder_L = pi * radius_cm**2 * height_cm / 1000; subtract existing rootball/fill when entered
Tapered pots use the frustum formula; rectangular pots use length × width × fill height. Subtract only measured root-ball or insert volume.
Example with the selected inputs
- Volume per container: 17.671 L
- Required quantity: 116.632 L
- Packs to buy: 3
- Purchase quantity: 120 L
- Left over: 3.368 L
Change the inputs to match your own task. Whole packages are rounded up after allowances, so purchase quantity and actual requirement can differ. Apply each allowance once.