Fish Tank Volume Calculator
Calculate your aquarium's water volume for stocking, filtration, dosing medications, and water change calculations. Supports rectangular, cylindrical, and bow-front tanks.
Aquarium Setup Guide
Filtration Rule of Thumb
Your filter should turn over the entire tank volume 4–6 times per hour. A 100-litre tank needs a filter rated at 400–600 litres/hour minimum. For heavily stocked tanks or large fish, use the higher multiplier.
Stocking Density
A common rule is 1cm of fish per litre of water for small community fish. This is a rough guide — large fish, messy eaters, and aggressive species require far more space than the formula suggests.
Medication Dosing
Always calculate your actual water volume (not the total tank volume) when dosing medications. Subtract displacement from substrate, rocks, and décor — typically 10–20% of tank volume.
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