Home & Cooking
Electricity Cost Calculator
Calculate the daily, monthly, and yearly cost of running any appliance. Shows kWh used, dollars spent, and CO2 emissions at US average rates.
Appliance usage
Yearly cost
$46.72
About $3.90 per month and $0.1280 per day.
Daily use
0.800 kWh
Monthly use
24.35 kWh
Yearly use
292.00 kWh
CO2 per year
108.3 kg
CO2 estimate uses the EPA eGRID U.S. average of 0.371 kg CO2 per kWh.
Frequently Asked Questions about the Electricity Cost Calculator
What is the average US electricity rate?
The US residential average sits at about $0.16 per kWh based on 2024 EIA data, but your state rate can be very different. Hawaii tops $0.40 per kWh while Washington and Idaho hover around $0.11. Enter your exact rate from your utility bill to get a precise result.
What is vampire load (phantom power)?
Vampire load is the electricity a device draws while plugged in but not actively in use, such as standby mode, idle chargers, or a smart speaker waiting for a wake word. Common culprits like game consoles, cable boxes, and phone chargers each pull 1-20 watts around the clock. The DOE estimates standby power adds $100-200 to the average household's annual bill.
What is the difference between watts and amps?
Watts measure power, the rate at which a device consumes energy right now, while amps measure electrical current. The two are linked by voltage: watts = volts x amps. On a standard US 120V outlet, a 1,200W microwave draws 10 amps. Your electricity bill charges you for kilowatt-hours (kWh), not amps.
What does kWh actually mean?
A kilowatt-hour is the energy a 1,000-watt device uses in one hour. Run a 100W light bulb for 10 hours and you consume 1 kWh. A 1,500W space heater running for two hours burns through 3 kWh. The calculator converts your wattage and daily hours into kWh to compute your cost.
Where does the CO2 number come from?
The calculator applies the EPA eGRID US national average of about 0.371 kg of CO2 per kWh to your yearly energy use. Your actual figure depends on your local grid mix. Coal-heavy states like West Virginia or Wyoming run significantly higher, while hydro and nuclear regions like Vermont or Washington are much lower.