Aquarium Substrate Calculator FAQ

Many simple aquariums use roughly 2-5 cm, while planted tanks often use deeper areas for roots or slopes. The right depth depends on plants, livestock, layout, and maintenance plan.

The same volume of sand, gravel, and aqua soil can weigh different amounts. Density converts litres into kg so the calculator can estimate bag count for products sold by weight.

Use litres if the bag is sold by volume. Use kg plus density if the bag is sold by weight. Do not assume kg and litres are interchangeable.

For a gentle slope, use the average of the front and back depths. For a strong slope, split the tank into foreground and background sections and add the estimates together.

Sometimes. Large hardscape can displace substrate, but it can also create deeper pockets around it. Plan the hardscape first when possible, then estimate the remaining areas.

No. It estimates quantity only. Species-specific substrate type, grain size, sharpness, and depth need separate research.

Follow the product instructions. Some sands and gravels need rinsing, while some planted aqua soils should not be rinsed heavily.

Substrate is sold in whole bags, and running short can interrupt a setup. Rounding up also helps cover small losses, slopes, and settling.

You can use the arithmetic if you enter the footprint, depth, density, and bag size, but reef livestock and substrate suitability must be checked separately.

Measure the area that will actually receive substrate. Exclude built-in compartments, large fixed structures, or areas occupied by equipment.