About Wattly

Wattly is a free suite of electricity and energy tools that turns confusing kilowatt-hours into numbers you can actually act on. Work out your monthly bill, see what each appliance really costs to run, compare tariffs and time-of-use rates, and check how fast solar or efficiency upgrades pay for themselves.

Every calculator runs instantly in your browser with no sign-up and no personal data collection. Regional rate data is sourced from the U.S. Energy Information Administration (EIA) and refreshed regularly.

We believe energy costs should be understandable. Instead of dense utility statements, we give you clear, instant estimates you can compare and act on. All results are transparent estimates — always confirm against your official utility bill before making financial decisions.

Have a question, correction, or suggestion? Email us at [email protected].