Thanks Weez and pain, it was, of course, human error

I put the top radius as the bottom radius and vice versa so the formula didn't work.

Now i've done it correctly and it comes out as 5 litres so yes about a gallon.

Hope that's not too small for my plants i thought i'd bought 6.5L pots.


Cheers,

nibs.
nibblebit Reviewed by nibblebit on . How to know exactly how many lgallons/itres your round plant pot is ... Hi. The workers at the place where i bought my pots didn't know how many litres they were, i judged they must be about 7 litres since they were 8" tall, 8" across the top and 6" across the bottom. I wanted to find out how much they really held so i looked for and found a formula that gives you the volume of a plant pot (in maths it's called a frustum of a cone), it gives the volume in cubic centimetres : Calculate volume of a truncated cone and its surface area (mobile) I plugged in Rating: 5