Electricity Bill Calculator

Your electricity bill is the sum of every device's energy consumption. The formula is simple: kWh = (watts × hours used × days per month) ÷ 1000, then multiply by your utility's rate per kWh. The challenge is identifying the biggest consumers — air conditioning, water heating, refrigeration, and electric vehicle charging dominate most household bills, while LED lights and small electronics are surprisingly cheap to run.

Sort the table by cost to see which appliances deserve attention. A 1,500W AC running 6 hours a day costs around $40/month at $0.15/kWh — replacing it with a 1,000W high-efficiency unit cuts that to ~$27. Switching incandescent bulbs to LEDs can save $50–100/year per fixture used heavily.

The US average rate is around $0.15/kWh, but ranges from $0.10 (Idaho) to $0.30+ (Hawaii, California). Check your last bill for your exact rate. Time-of-use plans charge more during peak hours — running dishwashers and dryers at night can cut that portion of your bill significantly.

For the biggest wins, audit "vampire loads" (devices drawing power when off), insulate your home, and consider a heat pump for heating/cooling. Smart plugs that monitor consumption pay for themselves quickly by revealing surprises.

Residential electricity rates in the United States average about $0.16 per kWh but vary from $0.10 (Idaho, Washington) to over $0.35 (Hawaii, California). Rates have risen 25% nationally since 2020, driven by transmission upgrades, weather-related disasters and the transition away from coal. Time-of-use tariffs that charge more during peak hours (typically 4–9 pm) are increasingly common — shifting laundry and EV charging to off-peak hours can cut bills meaningfully.

Standby power ("vampire loads") accounts for 5–10% of an average home's electricity use. Game consoles, set-top boxes, instant-on TVs, phone chargers and microwave clocks all draw power continuously. Smart power strips that cut power to peripherals when the main device is off can eliminate most vampire loads. The EPA estimates the average US household has 65 always-on devices — auditing yours can find $100–200 of annual savings.

Heating and cooling are usually the largest single line items in a household electric bill, often 40–50% of the total. Air-source heat pumps now deliver 3–4 units of heat per unit of electricity, making them dramatically cheaper to run than electric resistance heat and often cheaper than natural gas at current prices. The federal Inflation Reduction Act provides tax credits and rebates that can cover 30–100% of installation costs for income-qualified households.

LED lighting is the single best-return efficiency upgrade for almost any home. A 10-watt LED replaces a 60-watt incandescent and lasts 25,000 hours instead of 1,000. Whole-house retrofits typically pay back in 1–2 years and continue saving for a decade or more. Smart bulbs add convenience (schedules, dimming, voice control) at a small cost premium. Avoid the trap of buying cheap LEDs — name-brand bulbs from Cree, Philips and GE last longer and produce better light quality.