Estimate monthly kWh and running cost for aquarium equipment.
Open live calculator →180 watts running for 12 hours daily uses about 64.8 kWh in 30 days.
Combine the rated wattage of lights, filters, heaters and pumps with daily runtime and your local electricity price.
The live tool updates immediately and shows the result in the units commonly used by aquarium keepers around the world.
Heaters cycle rather than run constantly.
Use a plug-in meter for a precise reading.
Calculate seasonal room-temperature changes separately.
A typical heated, filtered and lit 100–200 litre freshwater tank uses roughly 30–70 kWh per month depending on climate and lighting hours. Heaters dominate in cool rooms; lights dominate in warm ones.
No—thermostatic heaters cycle on and off. In a warm room a heater may run 10–30% of the time, so multiplying its wattage by 24 hours grossly overstates cost. Use a plug-in energy meter for a true reading.
Insulate: use a lid to cut evaporation, back the tank away from cold walls, shorten the photoperiod to 6–8 hours, and choose LED lighting. In most homes these changes cut consumption meaningfully without harming livestock.