Pot Size Calculator
Calculate the correct pot diameter, depth, and volume for herbs, flowers, shrubs, and trees.
How to Use the Pot Size Calculator
- Select the type of plant you are potting.
- Measure and enter the root ball diameter in centimetres.
- Click Calculate to see the recommended pot size and volume.
- Choose a pot that meets or exceeds the recommended dimensions.
Casi d'Uso
- •Repotting houseplants to the correct size container.
- •Selecting pots for balcony or terrace gardening.
- •Choosing containers for vegetable or herb growing.
- •Planning a container garden with mixed plant types.
Formula
Pot diameter = Root ball × type multiplier. Pot depth = Root ball × depth multiplier. Volume (L) = π × r² × h / 1000.
Domande Frequenti
How much bigger should the pot be than the root ball?
Generally 1.5–2.5× the root ball diameter, depending on plant type. Trees need more room than herbs.
Does pot depth matter?
Yes. Deep-rooted plants like trees and shrubs need deeper pots to prevent root circling.
Is it free?
Yes, all calculators on OhMyCalc are completely free.