Free calculators for tank volume, fish stocking levels, heater sizing, and filter requirements.
Everything you need to plan and maintain a healthy aquarium.
Calculate exact water volume for rectangular, bow-front, cylindrical, and hexagonal tanks.
Calculate Volume →Check if your fish selection is appropriate for your tank size based on bioload.
Check Stocking →Determine the right wattage heater based on tank volume and room temperature.
Size Your Heater →Calculate the minimum filter flow rate (GPH) for your tank type and stocking level.
Calculate Flow →Bigger is usually better - larger tanks are more stable and forgiving.
Research fish compatibility and adult sizes before buying.
Heaters and filters must be properly sized for your tank.
The nitrogen cycle takes 4-6 weeks. Never add fish to an uncycled tank.
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