How to work out how much dough best fits in banneton(round)

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anyone know how to work out how much dough best fits in a banneton?  Sometimes I add seeds, nuts ect, and it always seems it's too big or little for the banneton I have to hand. I can work the volume on a tin, but I don't know where to start on a sloping sided container.  any help would be appreciated. 

The page couldn't be translated into English (even though the pop-up option appeared).  Does anybody have the ability to post it in English?  My 1 year of high school German was many decades ago.  Thanks!

... not sure what happened to the link; must have got lost in translation, so to speak!