Fish Stocking Calculator
Determine safe stocking levels for your aquarium
Avoid overcrowding and maintain healthy water quality. Our calculator considers fish size, bioload, filtration capacity, and territorial requirements—not just the outdated “inch per gallon” rule.
What You'll Calculate
- Maximum safe stocking capacity
- Current bioload percentage
- Compatibility warnings
- Filtration adequacy
Implementation
Advanced calculation engine that factors in multiple variables for accurate stocking recommendations.
Tank Information
Note: Calculator optimized for typical home/office aquariums (5-300 gallons)
Enter the power consumption of your filter in watts
Plants help reduce bioload by absorbing waste products
Add Fish
Note: This calculator uses bioload indices instead of the outdated “inch per gallon” rule. The listed fish serve as reference points for estimating bioload of similar species.
Results
Filtration Strength
Enter filter wattage to see results
Maximum Safe Stocking Capacity
Add fish and click calculate to see results
Current Bioload Percentage
Add fish and click calculate to see results
Compatibility Warnings
No fish added yet
Planted Tank Benefit
Select planted tank level to see benefits
Fish Database & Features
Our calculator includes a database of common fish species with bioload data, plus options for custom fish entry.
Database Features
- Common fish species with bioload indices
- Custom fish entry option
- Filtration strength based on wattage
- Planted tank bioload reduction factor
Bioload Index Guide
- Low: Small, low-waste fish (tetras, guppies)
- Medium: Moderate waste producers (bettas, angelfish)
- High: Heavy waste producers (goldfish, oscars)
