Plan your aquarium with practical, beginner-friendly tools. Calculate your tank’s estimated water volume, determine how much sand to buy, estimate the reef salt mix needed for your next batch of water, or see what your aquarium equipment may cost to run. Each calculator works instantly and supports the decisions that affect dosing, maintenance, and setup costs.
Choose an Aquarium Calculator
Choose the Right Aquarium Calculator
Use the aquarium water volume calculator when you need a more realistic estimate than the tank’s advertised capacity. Knowing the approximate amount of water in your system helps with water changes, medication, additives, heaters, pumps, and other equipment.
The aquarium sand bed calculator estimates the pounds of substrate and number of bags needed for your tank’s footprint and desired depth. If you are still selecting a substrate, compare the options in our beginner aquarium sand guide.
Use the reef salt mix calculator to plan a new batch of saltwater and estimate package usage. Always follow the directions on your salt container and verify the finished salinity with a calibrated refractometer. Our saltwater aquarium water-change guide explains how to prepare and replace water safely.
The aquarium electricity cost calculator estimates daily, monthly, and yearly energy use from your tank size, equipment, runtime, heater demand, and local electricity rate. Every starting assumption is editable, so use your equipment labels or a plug-in watt meter whenever you have better numbers.
Why Accurate Aquarium Measurements Matter
Aquarium labels usually describe the tank’s approximate capacity before accounting for the water line, sand, rock, equipment, and plumbing. Calculator results are therefore planning estimates—not laboratory measurements—but they provide a much better starting point for buying supplies and maintaining a stable aquarium.
Take a Reef Break
How far can your clownfish swim?
Tap, click, or press Space to guide Swimmy Fish through the reef.