#### Matt Holbrook-Bull

##### Founder

here is how to work out how many litres of substrate you need for a given tank size. And also how to calculate your tank volume in total if you need to.

the formula is:

(length x width x depth) / 1000 = litres.

so for a 60x45x50 with a substrate 5cm deep (uniform)

60 x 45 x 5 = 13500cm2 / 1000 = 13.5 litres.

Hope this helps.