What size pot?

Work out what your container can actually hold.

Pot labels describe width far more often than capacity, and every plant requirement here is written in litres. Measure the inside of your container and this converts it, then checks the result against each crop's documented minimum root room.

Measure your container

Measure the inside, from the base up to where the soil will sit — not the outer rim or the label.

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Inside diameter (cm)

Soil depth (cm)

The sides taper inward toward the base (most pots do). This reduces the usable volume to about 75% of a straight-sided container.

Enter the depth and diameter to see the volume.

Container size calculator