Electricity Cost Calculator
Estimate electricity costs for any appliance based on wattage, usage, and local rates.
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How It Works
Most US households pay between $0.10 and $0.25 per kWh, though rates vary by region and provider. Many utilities use tiered pricing (higher rates as you use more), time-of-use pricing (cheaper at night, more expensive during peak afternoon hours), or demand charges for high-draw appliances.
This calculator takes your appliance's wattage, daily usage hours, and local electricity rate, then projects the cost across hourly, daily, monthly, and yearly periods. It also estimates potential savings from switching to energy-efficient alternatives.
Tips & Best Practices
Frequently Asked Questions
How do I read my electricity meter?
Digital meters display the total kilowatt-hours (kWh) consumed. To find your usage for a period, subtract the previous reading from the current one. Smart meters transmit readings automatically to your utility provider.
What appliances use the most electricity?
Heating, ventilation, and air conditioning (HVAC) systems typically account for 40-50% of home electricity usage. Water heaters, clothes dryers, ovens, and refrigerators are also major consumers. LED lighting uses relatively little power.
How can I reduce my electricity costs?
Switch to LED bulbs, use a programmable thermostat, unplug devices when not in use, run appliances during off-peak hours, and ensure proper insulation. Energy-efficient appliances with ENERGY STAR ratings can also make a significant difference.
How is electricity cost calculated?
Cost = (Watts × Hours used per day × Days) / 1,000 × Rate per kWh. This converts watt-hours to kilowatt-hours and multiplies by your utility rate. Most residential rates in the US range from $0.10–$0.25 per kWh.
What is a kilowatt-hour?
A kilowatt-hour (kWh) is a unit of energy equal to using 1,000 watts for one hour. For example, a 100W light bulb running for 10 hours consumes 1 kWh. Your electricity bill charges you per kWh consumed.
What uses the most electricity in a typical home?
HVAC systems (heating and cooling) account for roughly 40-50% of home electricity use. Water heating is next at about 14%, followed by appliances (13%), lighting (9%), and electronics (7%). The exact breakdown varies by climate and household size.
What is time-of-use pricing?
Time-of-use (TOU) pricing charges different electricity rates depending on when you use power. Peak hours (typically afternoons and early evenings) cost more, while off-peak hours (nights and weekends) cost less. Shifting usage to off-peak times can significantly reduce your bill.
How much does it cost to run an air conditioner?
A typical central AC unit uses 3,000-5,000 watts. Running it 8 hours/day at $0.15/kWh costs roughly $36-$60/month. A window unit (500-1,500W) costs less. Using a programmable thermostat and raising the set point by just 2°F can cut cooling costs by 5-10%.
Do appliances use electricity when turned off?
Yes — many devices draw 'phantom' or 'standby' power when plugged in but not actively in use. TVs, game consoles, chargers, and cable boxes are common culprits. Phantom loads can account for 5-10% of your electricity bill. A smart power strip can eliminate this waste.
How much electricity does a solar panel save?
A typical 400W residential solar panel produces about 1.6-2.0 kWh per day depending on location and sunlight. A 6 kW system (15 panels) can offset 70-100% of average US household electricity use, saving $100-$200/month on electricity bills.