Electricity Cost Calculator

This electricity cost calculator helps you estimate how much it costs to run any electrical appliance or device. Simply enter the wattage, how many hours per day you use it, and your electricity rate to see your daily, monthly, and annual energy consumption and costs. Use the preset dropdown to quickly fill in common appliance wattages.

Finding your electricity rate: Your electricity rate is listed on your utility bill, usually expressed in cents or dollars per kilowatt-hour (kWh). In the United States, the average residential rate is about $0.16 per kWh, but rates vary significantly by state and utility provider. Some areas charge as low as $0.10/kWh while others exceed $0.30/kWh. If your bill uses tiered pricing, use your highest tier rate for a conservative estimate.

Understanding kilowatt-hours: A kilowatt-hour is a unit of energy equal to using 1,000 watts for one hour. For example, a 100-watt light bulb running for 10 hours uses 1 kWh. Your utility company charges you based on how many kWh you consume each billing period. The formula is simple: multiply the wattage by the hours of use, then divide by 1,000 to get kWh.

Phantom and standby power: Many devices continue to draw power even when turned off or in standby mode. This is called phantom power or vampire power. Common culprits include TVs, game consoles, chargers, and computers. Phantom loads can account for 5 to 10 percent of your total electricity bill. Using power strips with on/off switches or smart plugs can help eliminate standby power draw.

Energy-saving tips: To reduce your electricity costs, consider switching to LED bulbs, which use up to 80 percent less energy than incandescent bulbs. Use a programmable thermostat for heating and cooling. Run dishwashers and washing machines with full loads. Unplug devices when not in use. Look for ENERGY STAR certified appliances when making new purchases, as they meet strict energy efficiency guidelines set by the EPA.