Is an aquarium expensive to run?

The heater dominates in a cool room: a tight lid and insulated back panel cut its duty cycle noticeably. At typical use it adds about $12.03 to a monthly electric bill at the US-average rate, but that swings from $8.40 in the cheapest states to $31.29 in the most expensive.

How many watts does an aquarium use?

Aquarium typically draws about 100 running watts. It's a resistive load, so its startup and running wattage are the same. Check the nameplate or label on your specific unit for its exact rating.

How much electricity (kWh) does an aquarium use?

At typical use (100 W for 24 hours a day), an aquarium uses about 2.4 kWh per day — roughly 73 kWh per month, or about 8% of what the average US home uses in a month (863 kWh). Energy used doesn't depend on your electricity rate — only the bill does.

How can I lower the cost of running an aquarium?

The heater dominates in a cool room: a tight lid and insulated back panel cut its duty cycle noticeably. You can also cut the cost by lowering your electricity rate — many utilities offer cheaper off-peak hours — or simply by running it fewer hours. The calculator on this page shows how changing hours per day or your electricity rate moves the number.

How Much Does It Cost to Run an Aquarium?

A 55-gallon tank's heater, filter, and light average about 100 watts around the clock — fish are quiet, their equipment isn't free. At the US-average rate of 16.5¢/kWh, running an aquarium costs about $12.03/month ($144.36/year) at typical use. Adjust the watts, hours, and your rate below for your exact number.

Power (watts)

Hours per day: 24

Days per week: 7

Your state (sets the rate)

Electricity rate ($/kWh)

Cost to run an aquarium

$144/yr

Per day: $0.40
Per month: $12.03
Energy per year: 876 kWh

Cost = power (kW) × hours × days × your rate. Defaults are typical values — enter your appliance's actual watts (often on a label) and your real rate for a precise figure.

How much electricity does an aquarium use?

At 100 W for 24 hours a day, an aquarium uses about 2.4 kWh per day — roughly 73 kWh per month and 876 kWh per year. That's about 8% of the 863 kWh the average US home uses in a month. Energy use is the same everywhere — only the price per kWh changes your bill.

Wondering about the circuit instead? See how many amps an aquarium draws.

Cost to run an aquarium by electricity rate

Same 100 W appliance, 24 h/day — the bill changes with where you live.

Scenario	Rate	Per month	Per year
Cheapest states (North Dakota)	11.5¢	$8.40	$100.83
US average	16.5¢	$12.03	$144.36
Most expensive (Hawaii)	42.9¢	$31.29	$375.45

Find your state's rate on the electricity rates by state page, or see the appliance wattage chart for more devices.

Frequently asked questions

At the US-average residential rate of 16.5¢/kWh, an aquarium drawing 100 watts for about 24 hours a day costs roughly $0.40 per day, $12.03 per month, and $144.36 per year. Your actual cost depends on your electricity rate and how much you use it, and the calculator on this page adjusts for both.

Ask AI about this

Open an AI assistant with a question grounded in this page.

ChatGPT Claude Perplexity Google AI Grok

Electricity cost calculator Estimate your whole bill All appliances

How Much Does It Cost to Run an Aquarium?

How much electricity does an aquarium use?

Cost to run an aquarium by electricity rate

Frequently asked questions