Aquarium Running Cost Calculator — Fish Tank Energy Estimator
Instantly estimate the daily, monthly, and yearly electricity costs of your fish tank. Factor in heaters, filters, lighting, and pumps to budget accurately.
Quick Estimate or Itemized Breakdown?
Select how you want to calculate your aquarium’s energy usage. Use the quick estimator for a fast approximation, or the itemized breakdown for precise, equipment-level accuracy.
Quick Aquarium Cost Estimator
Get a fast approximation of your tank’s electricity costs
Sum of heater, filter, lights, etc.
Heaters cycle; 8-12 hrs is typical
UK average is ~28p/kWh. Adjust to your tariff.
Quick Estimate Result
Estimated daily, monthly, and yearly costs
Enter your tank’s details, then click Calculate Running Cost.
Itemized Aquarium Cost Calculator
Calculate costs based on individual equipment usage
Air pumps, CO2, wavemakers, etc.
Itemized Result
Detailed equipment breakdown and total costs
Enter your equipment details, then click Calculate Running Cost.
Average Equipment Wattage
Typical power consumption ranges for common aquarium equipment. Actual wattage varies by brand, tank size, and specific model. Always check the label on your device.
| Equipment Type | Average Wattage | Typical Daily Usage | Notes |
|---|---|---|---|
| Submersible Heater | 50W – 300W | 8 – 12 hours | Cycles on/off based on ambient room temperature. |
| Hang-On-Back Filter | 5W – 20W | 24 hours | Runs continuously for biological filtration. |
| Canister Filter | 10W – 50W | 24 hours | Higher flow rates require more wattage. |
| LED Aquarium Light | 10W – 100W+ | 6 – 10 hours | Reef/planted tanks use significantly more power. |
| Air Pump | 2W – 10W | 24 hours | Very low energy consumption overall. |
| Protein Skimmer (Reef) | 15W – 60W | 24 hours | Essential for saltwater setups, runs continuously. |
Aquarium Cost Calculator FAQ
Everything fish keepers ask about electricity usage, heaters, and reducing tank running costs.
The cost to run an average 60-litre (15-gallon) freshwater aquarium is typically between £3 and £8 per month, depending on equipment wattage, room temperature, and local electricity rates. Larger reef tanks with high-intensity lighting and heavy filtration can cost £20 to £50+ per month.
While an aquarium heater is plugged in 24/7, it does not draw power continuously. It cycles on and off to maintain the set temperature. Depending on the room temperature and tank insulation, a heater typically runs for 8 to 12 hours a day (a 30-50% duty cycle).
In most freshwater setups, the heater is the largest consumer of electricity. In reef or heavily planted tanks, high-intensity LED or T5 lighting, along with protein skimmers and return pumps, often become the primary drivers of energy consumption.
You can reduce costs by using energy-efficient LED lighting, ensuring your heater is appropriately sized (not oversized), adding a tight-fitting tank lid to reduce heat evaporation, keeping the tank away from cold drafts, and using a timer for lights and CO2 systems.
Check the label on each piece of equipment (heater, filter, light, pump) for its wattage (W). Add these numbers together for your total maximum wattage. For a more accurate running cost, multiply each device’s wattage by the number of hours it runs per day, sum them up, and divide by 1000 to get daily kWh.