Aquarium Tools & Calculators
Interactive calculators for curious fishkeepers β 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 β results update as you type. Understand usable water volume after substrate and decor, and compare against common tank sizes.
Open calculator βEstimate 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 β with gallons-per-fish guidance for planning communities.
Open calculator βCalculate the right daily feeding amount based on fish type and total body weight β tropical, goldfish, betta, cichlid or shrimp. Includes feeding frequency and flake equivalents, grounded in fish nutrition science.
Open calculator βBuild a water change schedule matched to your tank β weekly percentage and frequency based on tank age and stocking load. Smaller, frequent changes keep nitrates low and fish healthy.
Open scheduler βNot sure which fish to keep? Answer three quick questions about tank size, experience level and temperature β get a species recommendation matched to your setup, from beginner-friendly bettas to advanced discus.
Start quiz β