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Free Tools for Your Reef
Calculators and diagnostics for aquarists. Use them right now, no sign-up required.
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Featured ToolAINew
Reef Geomorphology
Visual zone map + coral placement recommendations by type.
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Free
Tank Volume Calculator
Gross and net volume for your aquarium in liters and gallons.
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Free
Parameter Diagnosis
Traffic-light status for your key reef aquarium parameters.
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Free
Salt Dosing Calculator
Grams of reef salt needed to reach your target salinity.
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Free
Water Change Calculator
Liters to change and resulting nitrate estimate.
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AI
Two-Part Dosing
ml/day of Part A and B to keep Ca and KH stable.
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Free
Kalkwasser Calculator
Grams of kalkwasser per liter of top-off water.
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