Aquarium electricity calculator

How much electricity does a saltwater aquarium use?

Let’s stop guessing. Tell me how large your tank is, what equipment you run, and what you pay for electricity. I’ll give you a useful estimate—and I’ll show you exactly where every number came from.

No signup. No hidden math. Change every assumption.

1Start with your tank

Choose one of our three beginner builds or enter any tank size.

Tank size in gallonsSuggested profiles cover 1–150 gallons.

Electricity rate ($/kWh)18.44¢ is the editable May 2026 U.S. average.

Average room temperature (°F)

Tank temperature (°F)

Tank and room conditionsThis only adjusts the heater estimate.

Measured heater runtime (optional)Percent of the day. Leave blank to estimate it.

Suggested starting profile
Medium · 26–75 gallons

2What is plugged in?

Check what you use. Open “Edit assumptions” only when you want more control.