Electricity Cost Calculator
Find out how much your devices cost to run per day, month, and year
US average is ~$0.12-0.16/kWh. Check your electricity bill for your rate.
Device
Watts
Hrs/Day
Qty
Frequently Asked Questions
How do I calculate the electricity cost of a device? +
Multiply the device wattage by hours of use per day, divide by 1000 to get kWh, then multiply by your electricity rate. For example, a 100W light bulb used 8 hours/day: (100 x 8) / 1000 = 0.8 kWh/day. At $0.12/kWh, that's $0.096/day or about $2.88/month.
How do I find my electricity rate? +
Check your electricity bill for the rate per kWh. In the US, the average residential rate is about $0.12-0.16 per kWh, but it varies by state. Look for "Price per kWh" or "Energy charge" on your bill. You can also check your utility company's website.
Where do I find the wattage of my device? +
Check the label on the device, its power adapter, or the product manual. Common wattages: LED bulb (10W), laptop (50-100W), desktop computer (200-500W), TV (50-200W), space heater (1500W), refrigerator (100-400W), air conditioner (1000-3500W).
What is a kilowatt-hour (kWh)? +
A kilowatt-hour is a unit of energy equal to using 1,000 watts for one hour. For example, a 1000W space heater running for 1 hour uses 1 kWh. A 100W light bulb running for 10 hours also uses 1 kWh. Your electricity bill charges you per kWh consumed.
Which devices use the most electricity? +
The biggest electricity consumers in a typical home are: central air conditioning (3000-5000W), electric water heaters (3000-4500W), space heaters (1500W), clothes dryers (2000-5000W), ovens (2000-5000W), and pool pumps (1000-2000W). These appliances account for the majority of most electricity bills.