Aquarium Sand Bed Calculator
Free reef tank calculator
Estimate how much aquarium sand you need
Enter the tank footprint and desired depth. The calculator gives a shopping estimate and rounds up to whole bags.
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How Much Sand Does Your Aquarium Need?
Enter the aquarium’s inside length and width, then choose the sand-bed depth you want. The calculator estimates the pounds and kilograms of substrate required and rounds the purchase recommendation up to whole bags.
A shallow sand bed is commonly chosen for appearance, biological surface area, and animals that sift or burrow. Deeper beds require substantially more substrate, so measure the tank footprint carefully before purchasing. Sand density varies by grain size and manufacturer, which is why the result should be treated as a practical shopping estimate.
Choosing Sand Depth and Grain Size
Fine sand creates a natural look but can move in strong flow. Medium-grain reef sand is a versatile option for many beginner saltwater aquariums, while coarse substrates are less likely to blow around but may trap larger pieces of debris. Read our beginner live-sand guide before selecting a product.
After planning the substrate, calculate your system’s estimated capacity with the aquarium water volume calculator. If you are preparing new seawater, use the reef salt mix calculator.