How much Subtrate do I need for my tank?

[anteatergoanna]

Hi everyone,
wondering if some-one can help me. I have 240 L tank that i want to put Black Caribsea Sand into. Just wondering how much i need, it is expensive so I don't want to get more than i have to. It comes in 9.2 kg bags.
My tank measurements are as follows
900L x 470H x 360W

I would like to have a reasonably heavily planted tank, though at the moment I am using pots (because the fish keep uprooting the plants), which looks quite nice, so if push came to shove, I would continue to use them.
Thanks

 

[Mr. Nowhere]

I believe it's one pound per gallon so if u just google the math that should give u an idea

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