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

https://aquarium-size-calculatordygw827.scriblorax.com/posts/from-around-the-web-here-are-20-amazing-infographics-about-aquarium-volume-calculator

Try an aquarium calculator to figure out just how much substrate, gravel, or sand you require. Get practical quotes based upon depth and tank measurements.