Electricity consumption & costs - Tools & Calculators

How to calculate the electricity cost of an aquarium?

Why track aquarium energy consumption?

Running an aquarium involves several electrical devices that operate continuously or for extended hours each day. Filters, heaters, lighting, CO₂ systems, and air pumps all contribute to your electricity bill. Understanding these costs helps you budget effectively and identify opportunities for energy savings.

Common aquarium devices and their power consumption

• Filter: 3–50 W (runs 24h/day) – External canister filters are typically 5–35 W, while internal filters use 3–15 W
• Heater: 25–300 W (cycles on/off) – A 100 W heater in a well-insulated tank may only run 30–50%% of the time
• LED Lighting: 10–100 W (6–10 hrs/day) – Modern LEDs are far more efficient than T5/T8 fluorescents
• CO₂ solenoid: 2–5 W (runs during lighting period) – Low power but runs many hours
• Air pump: 2–10 W (may run 24h or only at night)
• Wave maker/powerhead: 3–25 W (usually 24h/day)

The formula for calculating electricity costs

The basic formula is:

For example, a 50 W light running 8 hours at €0.40/kWh: (50 × 8 ÷ 1000) × 0.40 = €0.16/day or about €4.80/month.

Tips for reducing aquarium electricity costs

• Switch to LED lighting – uses 50–70%% less energy than fluorescent
• Insulate your tank (foam backing, lid) to reduce heater runtime
• Use timers to ensure lights and CO₂ only run when needed
• Choose energy-efficient filters – DC pumps are often more efficient than AC
• Place aquarium in a temperature-stable room to minimize heater use

Typical monthly costs by tank size

*Based on €0.40/kWh, LED lighting, moderate heating. Actual costs vary by equipment and climate.