Aquarium Substrate Calculator

Work out how much substrate a tank needs before you carry it home. Give the inside footprint and the depth you want, pick gravel, sand, aragonite or a planted mix, and it returns the bed volume, the weight in pounds and kilograms, and the number of bags once you type in a bag weight. Bulk density drives the whole answer, so the figure for each material is shown and can be overridden with whatever the bag prints. A third action runs it backwards: tell it what you already bought and it gives the depth that will spread across, plus a note on whether that depth suits plants.