Aquarium Stocking Level Calculator

How to calculate Aquarium stocking level calculator?

This calculator estimates your aquarium's stocking level and how much of your filter's capacity is being used based on tank volume and each fish's size and bioload.

Core formula: overall_stocking_level = (sum(adult_length_in_inches * bioload_factor) / tank_volume_gallons) * 100

Using the Aquarium stocking level calculator calculator: an example

Example values: 20‑gallon tank; Fish 1 = 2 in (Low bioload = 1); Fish 2 = 4 in (Medium bioload = 2).

Step-by-step calculation:

• Compute each fish's stocking value: Fish 1 → 2 in × 1 = 2; Fish 2 → 4 in × 2 = 8.
• Sum values: 2 + 8 = 10 (total_stocking_value).
• Divide by tank volume: 10 ÷ 20 gal = 0.5 → overall_stocking_level = 0.5 × 100 = 50%.
• Interpretation: 50% indicates a light-to-moderate stocking; check filtration similarly by dividing total_stocking_value by filter rated volume.

Frequently Asked Questions

What does bioload factor mean?

Bioload factor reflects how much waste a species produces; use Low for small, clean-water fish and High for messy, large species.

Should I use adult size or current size?

Always use expected adult length to avoid underestimating future space and filtration needs.

Can I replace one large fish with several small ones?

Possibly, but compare total_stocking_value and filtration load rather than fish count; many small fish can equal the bioload of one large fish.

When should I upgrade my filter?

Consider upgrading if filtration_capacity_used exceeds 100% or if you see persistent water-quality issues despite regular maintenance.