Work out how much potting mix fills your pots or raised beds, in litres, US gallons, quarts, cubic feet and cubic yards, and split it into a recipe.
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Potting mix needed
litres
| Unit | Each container | Total |
|---|
Your recipe
| Material | Parts | L | US gal | ft³ |
|---|
Bagged mix is usually sold by volume. Loose materials can fill gaps between larger pieces, so a blend can come out a little less than the sum of its parts.
Volume = π × (width ÷ 2)² × depth.
Volume = length × width × depth.
Volume = π × depth ÷ 12 × (top² + top × bottom + bottom²).
This treats the pot as a smooth cone with its tip cut off. Real pots with curved sides or thick rims hold a little more or less.
Enter the inside measurements of the container in inches, centimetres or feet. Round pots use π × (width ÷ 2)² × depth, boxes and raised beds use length × width × depth, and tapered pots are treated as a smooth cone with its tip cut off. Multiply by the number of containers, add an optional allowance for settling, and optionally share the total out in a recipe ratio you choose.
The result is the volume needed to fill each container to the rim. It doesn't subtract the root ball or a drainage layer, and curved or bellied pots come out approximate. It doesn't recommend a recipe: the ratio is whatever you enter.
