Electricity Cost Calculator
Free electricity cost calculator. Calculate energy bills for multiple appliances. Track kWh usage and costs.
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Last updated: January 2026
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Frequently Asked Questions
How do I calculate electricity cost for an appliance?
Cost = (Watts × Hours used × Days) ÷ 1000 × Rate per kWh. A 100W TV running 5 hours daily at $0.12/kWh: (100 × 5 × 30) ÷ 1000 × $0.12 = $1.80/month. High-wattage appliances (AC, heaters, dryers) cost significantly more—an AC unit might cost $50-150/month.
What appliances use the most electricity?
Top energy consumers: Central AC (3,000-5,000W), Electric water heater (4,000-5,500W), Clothes dryer (2,000-5,000W), Space heater (1,500W), Refrigerator (100-400W but runs 24/7). Heating and cooling typically account for 40-50% of home electricity bills.
How can I reduce my electricity bill?
Quick wins: Switch to LED bulbs (use 75% less energy). Use smart power strips to eliminate standby power. Set AC to 78°F in summer, 68°F in winter. Run dishwasher/laundry with full loads. Unplug chargers when not in use. Consider a smart thermostat for 10-15% savings.
What is a kilowatt-hour (kWh)?
A kWh is the energy used by a 1,000-watt appliance running for 1 hour. A 100W bulb for 10 hours = 1 kWh. A 2,000W air conditioner for 30 minutes = 1 kWh. The average US household uses about 900 kWh monthly. Check your bill for your rate—typically $0.10-$0.30 per kWh depending on location.
Does turning appliances off save electricity?
Yes, but 'off' isn't always off. Devices in standby mode (TVs, game consoles, chargers) use 'phantom' or 'vampire' power—up to 10% of your bill. A TV on standby uses 5-30W continuously. Use power strips to fully disconnect electronics, or choose ENERGY STAR products with lower standby consumption.