Free Aquarium Stocking Calculator — Plan Your Perfect Community Tank
The modern aquarium calculator. Check stocking levels, fish compatibility, and water parameters — all in one place.
Unlike outdated calculators, we adjust for planted tanks, filtration quality, and your maintenance schedule.
Smart Aquarium Planning Tool
A modern toolkit for the modern fishkeeper. No more outdated calculators.
Smart Stocking Calculator
Goes beyond the outdated inch-per-gallon rule. Our algorithm considers bioload, filtration, and fish behavior.
Compatibility Checker
Instantly see temperature, pH, and aggression conflicts. No more guessing if fish can live together.
Fish Species Database
209 species with detailed care requirements, tank size needs, and compatibility notes.
Designed for Real-World Tank Conditions
Why fishkeepers choose us over outdated alternatives
Planted Tank Support
Our calculator adjusts stocking capacity based on your plant density — something other calculators ignore.
Filtration Matters
Heavy filtration? Light filtration? We factor it in for accurate results.
Maintenance Flexibility
Tell us how often you do water changes, and we'll adjust recommendations accordingly.
Mobile-First Design
Plan your tank from anywhere — no clunky desktop-only interfaces.
How It Works
Four simple steps to a perfectly stocked tank
Enter Your Tank
Select your tank size and filtration level
Add Fish
Search and add fish from our database
Get Analysis
Receive instant stocking recommendations
Save & Share
Get a unique link to your tank setup. Share it on forums, Reddit, or with friends for feedback.
Betta
Betta splendens
Neon Tetra
Paracheirodon innesi
Guppy
Poecilia reticulata
Bronze Corydoras
Corydoras aeneus
Angelfish
Pterophyllum scalare
Cherry Shrimp
Neocaridina davidi
Frequently Asked Questions
Got questions? We've got answers.