Calculators · Electricity cost
Electricity cost calculator
Estimate what your electricity costs — by the day, month, or year — at your utility's actual rate. Pick your utility and we fill the rate in for you. It all runs in your browser; nothing you enter is sent anywhere.
per day
$3.68
per month
$112.15
per year
$1344.76
At 12.46¢/kWh, 900 kWh per month costs about $112.15.
Runs entirely in your browser — nothing you type is sent anywhere. Estimates only; your actual bill depends on your usage and includes delivery charges on top of the supply rate.
The formula
Electricity is billed by the kilowatt-hour (kWh). The math is just: cost = kWh × your rate. To get kWh from an appliance's wattage: kWh = (watts × hours) ÷ 1000. So a 1,000-watt device running 1 hour uses 1 kWh — and at 13¢/kWh, that's 13¢.
Common questions
- How do I calculate my electricity cost?
- Multiply your energy use in kilowatt-hours (kWh) by your rate in dollars per kWh: cost = kWh × ($/kWh). To go from an appliance's wattage: kWh = (watts × hours) ÷ 1000. This calculator does both, pre-filled with your utility's current rate.
- What's a good price per kWh?
- It varies a lot by state — roughly 17¢/kWh is near the U.S. residential average, but our covered states range from the low teens to the high teens. Pick your utility above to see its current default-supply rate.
- Why doesn't this match my bill exactly?
- Two reasons: this uses the supply (generation) rate, while your bill also has delivery/distribution charges and fixed fees on top; and your real usage varies month to month. Use it for estimates and comparisons, not to the penny.
Paying more than your utility's rate to a supplier? That's the one fixable overcharge.
Run the free bill audit →