Aquarium Calculators
Every tool you need to plan your aquarium — from working out tank volume and stocking levels to sizing heaters, filters, and substrate.
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Aquarium Volume Calculator
Calculate tank capacity in US gallons and liters, plus actual water volume.
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Aquarium Stocking Calculator
Plan how many fish your tank can support with a proper stocking assessment.
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Aquarium Substrate Calculator
Work out how much substrate (gravel, sand, or soil) your tank needs.
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Aquarium Gravel Calculator
Calculate gravel amount and weight for your tank size and depth.
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Aquarium Weight Calculator
Estimate total tank weight: water, glass, substrate, decor, and equipment.
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Aquarium Heater Calculator
Find the right heater wattage range for your tank and room temperature.
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Aquarium Filter Calculator
Size your filter flow rate based on tank volume and turnover rate.
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Aquarium Water Change Calculator
Calculate how much water to remove and replace during a water change.
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Fish Tank Size Calculator
Match a species (and school size) to the right tank dimensions.
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