How Much Does It Cost to Run an Appliance?
Electricity cost = wattage (W) ÷ 1,000 × daily hours × days × rate ($/kWh). A 1,000W space heater running 8 hours a day for 30 days consumes 240 kWh. At $0.14/kWh that's $33.60/month. Your actual bill will include taxes, delivery charges, and fixed fees, so real costs are typically 20–30% higher than the energy-only calculation.
Common Appliance Wattages
Space heater: 750–1,500W / Central air conditioner: 3,000–5,000W / Refrigerator: 100–400W / Clothes dryer: 4,000–6,000W / Washing machine: 500–1,000W / Dishwasher: 1,200–2,400W / 55-inch TV: 80–150W / Desktop PC + monitor: 150–400W / Laptop: 40–100W. These are general ranges; check your appliance's nameplate for exact wattage.
US Electricity Rates by State
The national average electricity rate in the US is about $0.14/kWh (2024). Hawaii has the highest residential rates (~$0.37/kWh), followed by Connecticut and Massachusetts (~$0.22–$0.25/kWh). The cheapest states include Louisiana, Oklahoma, and North Dakota (~$0.09–$0.10/kWh). Check your utility bill or EIAA website for your local rate.
Reducing Your Electricity Bill
Phantom loads (standby power) from TVs, game consoles, chargers, and microwaves can add up to 5–10% of total household consumption. Smart power strips cut phantom loads automatically. Running large appliances (dishwasher, laundry) during off-peak hours can reduce costs if your utility offers time-of-use pricing.
Frequently Asked Questions
A 100W TV running 8h/day for 30 days = 24 kWh. At $0.14/kWh that's about $3.36/month — quite affordable.
A 1,500W heater running 8h/day for 30 days = 360 kWh. At $0.14/kWh that's $50.40/month, making it one of the most expensive appliances to run.