May be useful

Width by depth

Black Pots
1 litre
13cm
10cm

Black Pots
1.5 litres
15cm
12cm

Black Pots
2 litres
17cm
13cm

Black Pots - Deep
2 litres
15cm
15cm

Black Pots
3 litres
19cm
14.5cm

Black Pots - Deep
3 litres
17.5cm
19cm

Black Pots
5 litres
22cm
18cm

Black Pots
7.5 litres
26cm
20cm

Black Pots
10 litres
28cm
23cm

Black Pots
15 litres
32cm
26cm

Black Pots
20 litres
37cm
27.5cm

Black Pots
25 litres
40cm
28cm

Black Pots
30 litres
40cm
33cm

I love you man i vas wondering for i year now about corect size, i usually took 20L off compost and fill pots to see what size it is aproximaly ....of to measure cm/size of mine ,thanks

aww shucks your very welcome buddy glad it helps

so these are mine ,that would be like 7.5L?

21.5cm deep and 26cm wide

Thats 11L.

Check out the cylinder conversion tool --HERE--

Am confused now about size off my pots ,i took 3 off those and 20L bag off compost ,i filled 3 off them full to top.I was under impresion they are 6.5L pots

and up on post it states
Black Pots
7.5 litres
26cm
20cm

I hope they are 11L if they are i dont need to pot up anymore,are you sure?


mine seem closest to them

Your pots look like they have a large taper, more cone shaped, so your probably right.

i already over joyed i was wrong and veg. was done bollox i need 11L pots now

thanks for clearing it out mate

Tip for working out volume of round pot.

1) measure the diameter of the pot at the top and the bottom and take the average of the two.

E.g. 26cm wide at top, 16cm at bottom - average is 26+16/2=21cm
Also measure the height - eg. 20cm

2) Then use the formula for volume of a cyclinder using the average diameter figure.

This is H_PIR² where H is the height of the pot and R is the average radius (1/2 the diameter) and _PI is 3.14

So for the example pot the volume would be 20x3.14x10.5x10.5 = 6923.7 cm³

i.e just under 7 litres.......

Great post BluePixie