Electricity Cost Calculator
Calculate daily, monthly, and yearly electricity costs for any appliance. Enter wattage, usage hours, and electricity rate to get precise cost estimates and CO2 emissions.
Parameters
Power consumption in watts.
Average number of hours the device runs per day.
Your electricity rate. US average is about $0.15/kWh.
Calculate for this many days.
Results
Other results (5)
Based on 30 days per month
Based on 0.42 kg CO₂ per kWh (US average grid intensity)
Why Choose Electricity Cost Calculator
The Electricity Cost Calculator helps you estimate the daily, monthly, and yearly cost of running any electrical appliance based on its wattage and usage hours. It also calculates total energy consumption in kilowatt-hours and the equivalent carbon dioxide emissions, helping you make informed decisions about energy usage and sustainability.
- ✓Calculate daily, monthly, and yearly electricity costs
- ✓Supports custom electricity rates per kilowatt-hour
- ✓Estimates annual CO2 emissions based on US grid average
- ✓Works for any appliance from light bulbs to HVAC systems
How to Use
- 1Enter the wattage of the appliance or device you want to analyze.
- 2Specify how many hours per day the device typically runs.
- 3Enter your electricity rate in dollars per kilowatt-hour (check your utility bill).
- 4Set the number of days per month for your billing period.
- 5Review the daily, monthly, and yearly cost breakdown along with CO2 emissions.
Frequently Asked Questions (FAQ)
How do I find the wattage of my appliance?
Most appliances have a label or sticker showing the wattage (W). You can also check the user manual or look up the model online. For devices with variable power (like air conditioners), use the average or running wattage rather than the peak.
What is the average electricity rate in the US?
As of 2024, the average residential electricity rate in the US is approximately $0.15 per kilowatt-hour, but this varies significantly by state. Rates can range from about $0.10 in some southern states to over $0.30 in Hawaii and parts of the northeast.
How is CO2 emission calculated?
The calculator uses 0.42 kilograms of CO2 per kilowatt-hour, which is the average emission intensity of the US electricity grid. This accounts for the mix of fossil fuels, nuclear, and renewable energy sources used to generate electricity.
Does this account for standby power consumption?
No. The calculator only accounts for active usage hours. Many devices draw standby power (often 1-5 watts) when turned off but still plugged in. Add those hours separately if you want a complete picture.
How can I reduce my electricity costs?
The most effective strategies include switching to LED lighting, using smart power strips to eliminate standby consumption, running appliances during off-peak hours if your utility offers time-of-use rates, and upgrading to Energy Star rated appliances.
Authoritative References & Sources
U.S. Energy Information Administration (EIA)
View SourceEPA Greenhouse Gas Equivalencies
View SourceEnergy Star
View SourceRelated Tools
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