Aquarium Tools
Interactive calculators for curious fishkeepers — tank volume, stocking limits, feeding amounts, water changes and the fish finder quiz.
Convert your tank's length, width and height into gallons and liters instantly — results update as you type. Understand usable water volume after substrate and decor, and compare against common tank sizes.
Open calculator →Estimate how many fish your aquarium supports using the inch-per-gallon rule with adjustable confidence. Enter tank volume and adult fish size to get a safe stocking number — with gallons-per-fish guidance for planning communities.
Open calculator →Calculate the right daily feeding amount based on fish type and total body weight — tropical, goldfish, betta, cichlid or shrimp. Includes feeding frequency and flake equivalents, grounded in fish nutrition science.
Open calculator →Build a water change schedule matched to your tank — weekly percentage and frequency based on tank age and stocking load. Smaller, frequent changes keep nitrates low and fish healthy.
Open scheduler →Not sure which fish to keep? Answer three quick questions about tank size, experience level and temperature — get a species recommendation matched to your setup, from beginner-friendly bettas to advanced discus.
Start quiz →