TankForgeAvailable on iOS, Android, and Web (Beta)
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Free aquarium tools

Useful calculations without a sign-in.

Estimate water volume, convert salinity, and plan water changes. These tools run in your browser and do not save aquarium data.

Aquarium Water Volume CalculatorEstimate actual aquarium water volume after substrate and rock displacement.Salinity and Specific Gravity ConverterConvert salinity in parts per thousand and specific gravity at 25°C.Aquarium Water Change CalculatorTurn a water-change percentage into gallons and liters for your system.