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Practical calculators to help you plan your aquarium — from tank volume to water changes and CO₂. Every tool explains its assumptions so you know exactly what the numbers mean.
Personalized first-tank plan in minutes
Open toolVolume, substrate, stocking, water, CO₂ & light on one screen
Open toolCalculate tank water volume
Open toolPlan water changes & parameter impact
Open toolEstimate dissolved CO₂ from KH/pH
Open toolMeasure liquid fertilizers & medications
Open toolPick the right flow rate for your tank
Open toolBatch marine salt for reef water changes
Open toolEstimate LED watts for planted tanks
Open toolCheck capacity with the 1″/gallon rule
Open toolCheck species compatibility & stocking together
Open toolPick symptoms and get ranked likely causes
Open tool