What size aquarium?

Hello.

I have a slightly strange question.

If I have just over 3KG of sand, what size of aquarium would I be able
to use this sand in as a substrate do you think?

I know this is a strange way of doing it because normally you choose
the aquarium and then buy enough sand or whatever to cover it, however
this sand I got is special and the place I got it from is thousands of
miles away and I only have just over 3KG of it.

I know it might be a smallish tank, and it would probably have to be
freshwater tropical not marine, but I'd really appreciate any help in
calculating this, or any links you know of that say how much sand you
need to cover different sizes of aquarium.

I actually plan to add a layer of Flourite underneath it and have it
mainly as a planted tank, perhaps with a couple of fish.

There is a chance I could always have a slightly bigger tank than it
would cover and just be innovative with the space it won't cover by
adding other things.

Anyway thanks very much for your help

John