Fish tank, filter, heater, and aquarium cost calculators. Browse our free aquarium tools below — all calculators are instant, accurate, and require no sign-up.
Aquarium Filter GPH Calculator — Calculate the minimum filter flow rate (GPH) for your aquarium. Freshwater needs 4× turnover, saltwater 6-10× per hour.
Aquarium Cost Calculator — Estimate the total cost of setting up and maintaining an aquarium. Includes equipment, livestock, electricity, food, and supplies.
Aquarium Lighting Calculator — Calculate the right aquarium light wattage by tank type. Fish-only: 1-2 W/gal, planted: 2-5 W/gal, reef: PAR-based lighting.
Aquarium Heater Size Calculator — Calculate the right wattage aquarium heater for your tank. Uses tank gallons and temperature differential to recommend heater wattage.
Fish Food Amount Calculator — Calculate how much to feed your fish daily. Feed what fish consume in 2-3 minutes, 1-2 times per day, based on fish count and size.
Aquarium Water Change Calculator — Calculate how much water to remove and replace during aquarium water changes. Use 10-25% weekly changes to maintain water quality.
Saltwater Mix Calculator — Calculate the amount of salt mix needed for your saltwater aquarium. Target specific gravity 1.023-1.025 for marine fish and corals.
Fish Tank Size Calculator — Calculate the ideal aquarium size for your fish based on species, adult length, and bioload. Use the 1 gallon per inch rule with adjustments.