Aquarium Calculators
Free aquarium calculators for tank volume, stocking levels, CO2 injection, and water change schedules.
Tools for freshwater and saltwater aquarists.
Aquarium Heater Size Calculator
Calculate the correct wattage aquarium heater for your tank size and room temperature. Avoid underpowered heaters that can't maintain fish health.
Aquarium Tank Volume Calculator
Calculate the actual water volume of your aquarium in gallons and liters, accounting for substrate, rocks, and equipment displacement.
Aquarium Water Change Schedule Calculator
Calculate how much water to change and how often to keep your aquarium healthy. Based on tank volume, stocking level, and filter quality.