U.S. home energy calculator
Turn watts into dollars.
See what any appliance costs to run using the latest available residential electricity rate for your state.
U.S. residential average18.44¢per kWh · May 2026
Electricity cost calculator
What does it cost to run?
Energy180.00 kWh
Cost for 30 days$33.19
Per day$1.11
Annualized$403.84
Uses the selected state's latest EIA residential average unless you enter your own utility rate. Taxes, fixed charges, tiers and time-of-use pricing are not included.
Why WattCost?
Most electricity calculators make you find and type a rate yourself. WattCost starts with current state-level residential averages from the U.S. Energy Information Administration, then lets you replace that rate with the exact number on your utility bill.
State averages are a benchmark, not a quote. Utility tariffs can include fixed fees, taxes, usage tiers, seasonal pricing and time-of-use rates.