Aquarium Heater Wattage Calculator
Size aquarium heater by tank and temp diff.
Enter values above — results appear instantly as you type.
Formula
~5W per gallon × temp factor
Example
30 gal, 10°F diff → 150W heater.
Size aquarium heater by tank and temp diff.
~5W per gallon × temp factor
30 gal, 10°F diff → 150W heater.