Fish Stocking Calculator

Determine the maximum number of fish for your aquarium based on tank size and filtration.

Tank Volume (gallons)

Filtration Type

Fish Size Category

Better filtration allows a slightly higher stocking density.

Choose small, medium, or large to match your fish species.

Follows the inch-per-gallon rule adjusted for fish size and filtration.

Calculate aquarium volume in gallons and liters for rectangular, bowfront, cylinder, and hexagonal tanks. Free tool.

Calculate the right heater wattage for your aquarium based on tank volume and temperature difference. Free tool.

Calculate CO2 levels in your planted aquarium from pH and KH readings. Optimize plant growth. Free tool.

Calculate fertilizer doses for planted aquariums. Supports EI dosing, PPS-Pro, and custom schedules. Free tool.

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