🐠 Fish Calculator for Aquarium
Estimate safe fish stocking capacity | 1 inch per gallon rule + filtration factor
Aquarium Stocking Calculator
Recommended Stocking
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Enter values to calculate safe fish count
Based on the classic "1 inch of fish per gallon" rule + adjustment factor
How to Use This Fish Calculator
Simply enter your aquarium volume, choose gallons or liters, input the average adult size of your fish (in inches), and select your filtration strength. The aquarium stocking calculator applies the trusted "1 inch per gallon" rule and adjusts for filtration efficiency. Perfect for freshwater tropical communities, but also useful as a baseline for other setups. This tool is your go-to fish calculator for aquarium needs.
Pro tip: Always understock slightly and test water parameters regularly.
📖 Frequently Asked Questions
Is the 1 inch per gallon rule accurate?
It's a good starting guideline but doesn't account for fish shape, bioload, or swimming space. Our filtration factor improves accuracy for your aquarium fish calculator results.
Can I use this for saltwater tanks?
Yes, but saltwater fish often need more territorial space. Consider reducing the final number by 15-20% as a safety margin when using this stocking calculator.
How do I convert liters to gallons?
The fish tank calculator does it automatically: 1 US gallon = 3.785 liters. Just select "Liters" and enter your tank volume.
What is the filtration factor?
It adjusts capacity based on your filter strength. Heavily planted or over-filtered tanks can safely hold slightly more fish. This makes our aquarium stocking tool more realistic than basic calculators.