Electricity Cost Calculator
Calculate how much an appliance costs to run based on wattage and usage hours. Use this free online tool for instant, accurate results. No signup needed.
Cách tính hóa đơn tiền điện
Electricity is billed in kilowatt-hours (kWh). One kWh = running a 1,000W (1 kW) device for exactly 1 hour. To calculate consumption: kWh = (Watts × Hours per day × Days) / 1,000.
A 100W light bulb running 8 hours/day for 30 days: (100 × 8 × 30) / 1,000 = 24 kWh. At $0.15/kWh, that costs $3.60/month. A 1,500W space heater running 6 hours/day all month: 270 kWh = $40.50/month.
Chi phí điện trung bình của Hoa Kỳ
The US average residential electricity rate is approximately $0.13–0.16/kWh (2024), with significant state variation: Hawaii (~$0.39), California (~$0.26), Louisiana (~$0.11), Oklahoma (~$0.11). The average US household uses about 900 kWh/month.
Major electricity consumers in a typical home: HVAC (45%), water heater (18%), lighting (9%), washer/dryer (7%), refrigerator (5%). Targeting HVAC and water heating offers the biggest savings.
Giảm hóa đơn tiền điện của bạn
Most impactful changes: switch to LED bulbs (75% less energy than incandescent), upgrade to a smart thermostat (save 10–15% on HVAC), wash clothes in cold water, use power strips to eliminate standby power (phantom load), ensure proper home insulation, run dishwashers and laundry during off-peak hours. Solar panels can offset 50–100% of household electricity depending on location and system size.
Frequently Asked Questions
Chi phí để chạy một chiếc TV là bao nhiêu?
A modern 55-inch LED TV uses 60–150W. Running it 5 hours/day at $0.15/kWh costs $1.35–$3.38/month. Older plasma TVs used 300–500W — up to 5x more. OLED TVs vary widely based on brightness.
Cái gì sử dụng nhiều điện nhất trong một ngôi nhà?
Heating and cooling (HVAC) typically accounts for 40–50% of residential electricity use. Water heating, refrigerators, washer/dryers, and lighting follow. In winter climates, an electric space heater running all day can easily double your electricity bill.
Sự khác biệt giữa kW và kWh là gì?
kW (kilowatt) is a unit of power — the rate of energy use at any instant. kWh (kilowatt-hour) is a unit of energy — the total amount used over time. Your electricity bill charges for kWh, not kW. A 2 kW device running for 3 hours uses 6 kWh.