Aquarium & Terrarium Calculators
Essential aquarium and terrarium calculation tools. Calculate tank volume, substrate needs, CO2 levels, heater sizing, fish stocking, fertilizer dosing, and more.
Aquarium Volume Calculator
Calculate aquarium volume for rectangular, cylindrical, and bow-front tank shapes. Supports liters, gallons, and cubic inches.
Substrate Calculator
Calculate how much substrate (gravel, sand, soil) you need for your aquarium based on tank dimensions and desired depth.
CO2 Bubble Count Calculator
Calculate CO2 concentration from KH and pH values, and determine the optimal bubble rate for your planted aquarium.
Salt Mix Calculator
Calculate the amount of salt mix needed to achieve target salinity for your saltwater or reef aquarium.
Heater Wattage Calculator
Calculate the required heater wattage for your aquarium based on tank volume, room temperature, and target water temperature.
Light Intensity (PAR) Estimator
Estimate how water depth attenuates light intensity (PAR) for planted aquariums. Plan lighting for optimal plant growth.
Stocking Calculator
Calculate how many fish your aquarium can support using the inch-per-gallon rule. Avoid overstocking your tank.
Fertilizer Dosing (EI Method)
Calculate Estimative Index (EI) fertilizer dosing amounts for your planted aquarium based on tank volume.
Medicine Dosage Calculator
Calculate the correct dosage of aquarium medications (malachite green, methylene blue, etc.) based on tank volume.
Water Change Calculator
Calculate how water changes affect nitrate and other concentrations in your aquarium. Plan water change schedules.