Electricity Bill Calculator

Breaking a power bill down appliance by appliance turns an opaque monthly charge into something you can actually act on. Once you see which devices dominate your consumption, choices about what to unplug, replace, or run less often stop being guesswork.

Each appliance contributes energy measured in kilowatt-hours, found by dividing its wattage by 1000, then multiplying by the hours it runs per day, by the quantity and by 30 days. Summing those figures across every device gives total monthly kWh, which is then multiplied by your rate per kWh. The rate field starts at $0.14; EIA's U.S. residential average was 17.30 cents in 2025 (preliminary) and 18.34 cents in June 2026, and state averages swing widely above and below that, so the rate on your own bill is the one to use.

Accuracy hinges on the wattage you enter, so read the label on the device itself rather than estimating. Daily run-time is the other trap, easy to undercount for anything that idles on standby. Phantom load deserves a line of its own: televisions, chargers, and game consoles keep drawing power even when they appear to be off, and over a month that quiet draw adds up.