Try an aquarium calculator to determine how much substrate, gravel, or sand you require

https://fish-tank-size-calculatortfek201.quantlynix.com/posts/where-are-you-going-to-find-calculate-aquarium-volume-1-year-from-today

Attempt an aquarium calculator to determine just how much substrate, gravel, or sand you require. Get useful quotes based upon depth and tank measurements.