25 cm (10") wide across the top
25 cm (10") downwards
it is a square (geometric) pot design, as I heard these are efficient space wise. I have tried a few conversion websites but none seem to allow to work out the capacity of a container if you have the dimensions in length.
the pot is in the store and 2 of them side by side fit perfectly inside my grow cab which is 55 cm wide but before I buy I want to know if they're at least 3 gallon each. and the maker of the pot doesn't put the capacity on their packaging (duh?)