Stocking Level Calculator
Calculate how many fish your aquarium can hold using the inches-per-gallon rule with adjustments.
Results
Visualization
How It Works
The classic "one inch of fish per gallon" rule is a rough starting point. It works for small, slender fish but breaks down for large, deep-bodied, or messy species. A 10-inch oscar produces far more waste than ten 1-inch tetras. Always research specific species requirements and stock gradually over weeks.