Electricity Cost Calculator
Calculate the cost of running any electrical appliance or device. Find out how much you're spending on electricity and identify ways to save money.
Understanding Electricity Costs and Consumption
Electricity costs can be confusing, but understanding how your devices consume power helps you make informed decisions about energy usage and identify opportunities to reduce your electric bill. This calculator helps you understand the true cost of running appliances and electronics.
How Electricity Usage is Measured
Electricity consumption is measured in kilowatt-hours (kWh), which represents using 1,000 watts of power for one hour. The formula is simple:
kWh = (Watts Γ· 1000) Γ Hours Γ Days Cost = kWh Γ Rate per kWh Common Appliance Power Consumption
Understanding typical wattages helps you estimate costs and identify energy-hungry devices:
π Everyday Appliances
π» Electronics
π‘οΈ Climate Control
π‘ Lighting
Electricity Rates Across the US
Electricity rates vary significantly by location and can dramatically affect your costs:
| Region | Average Rate | Low End | High End |
|---|---|---|---|
| South | $0.12/kWh | $0.09 | $0.17 |
| Midwest | $0.14/kWh | $0.10 | $0.18 |
| West | $0.16/kWh | $0.11 | $0.25 |
| Northeast | $0.20/kWh | $0.14 | $0.35 |
Standby Power: The Hidden Cost
Many devices consume power even when "off" or in standby mode. This phantom load can add 5-10% to your electricity bill:
πΊ Entertainment
- TV: 1-5W standby
- Cable box: 15-45W
- Gaming console: 1-15W
- Audio system: 5-15W
π» Office Equipment
- Desktop computer: 2-8W
- Monitor: 1-6W
- Printer: 1-15W
- Phone charger: 0.5-2W
π Household Items
- Microwave: 2-8W
- Coffee maker: 2-4W
- Garage door opener: 2-7W
- Security system: 2-5W
Energy-Saving Strategies
Use this calculator to identify your biggest energy users, then apply these strategies:
π Immediate Actions
- Unplug devices when not in use, especially chargers and small appliances
- Use power strips to easily turn off multiple devices at once
- Adjust thermostat by 2-3Β°F to save 10-15% on heating/cooling
- Switch to LED bulbs - they use 75% less energy than incandescent
π‘ Smart Usage Habits
- Run dishwashers and washing machines with full loads
- Use cold water for laundry when possible (saves water heating costs)
- Air-dry clothes instead of using the dryer when weather permits
- Cook efficiently using microwaves, slow cookers, or pressure cookers
π Long-term Improvements
- Upgrade to Energy Star appliances when replacements are needed
- Improve insulation to reduce heating and cooling loads
- Install a programmable thermostat to optimize temperature control
- Consider solar panels or other renewable energy options
Reading Your Electricity Bill
Understanding your bill helps you use this calculator effectively:
π Key Information to Find
- kWh used: Total electricity consumed during billing period
- Rate per kWh: What you pay per kilowatt-hour (may vary by usage tier)
- Demand charges: Additional fees for peak usage (commercial accounts)
- Time-of-use rates: Different rates for peak vs. off-peak hours
Cost Comparison Examples
See how different choices affect your electricity costs:
π‘ Lighting Comparison (10 bulbs, 5 hours/day)
βοΈ Air Conditioning (8 hours/day, summer)
Peak vs. Off-Peak Pricing
Some utilities charge different rates based on when you use electricity:
- Peak hours: Usually 4-9 PM weekdays - highest rates
- Off-peak hours: Nights and weekends - lowest rates
- Shoulder hours: Mid-range rates during moderate demand
If you have time-of-use pricing, schedule high-energy activities (laundry, dishwashing, electric vehicle charging) during off-peak hours to save money.
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Aggiornato Febbraio 2026 Β· Testati e verificati
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Frequently Asked Questions
How do I calculate electricity costs?
Multiply wattage by hours used and days, then divide by 1000 to get kWh. Multiply kWh by your electricity rate ($/kWh) to get the total cost.
What is a kilowatt-hour (kWh)?
A kWh is a unit of energy equal to using 1000 watts for one hour. It's how electric companies measure and bill for energy consumption.
What is the average electricity rate in the US?
The average US electricity rate is around $0.16/kWh, but it varies significantly by state, from about $0.10/kWh to $0.35/kWh or more in some areas.
How much electricity do common appliances use?
LED bulbs use 10W, laptops 50W, TVs 150W, refrigerators 250W, microwaves 1000W, and air conditioners 1500W. Check appliance labels for exact wattage.
Why is my electricity bill so high?
High bills often result from heating/cooling systems, old inefficient appliances, poor insulation, or leaving devices on constantly. Use this calculator to identify energy-hungry appliances.
How can I reduce electricity costs?
Switch to LED bulbs, unplug unused devices, use efficient appliances, adjust thermostat settings, improve insulation, and consider peak/off-peak rates.
Do devices use electricity when plugged in but off?
Yes, many devices use "phantom" or "standby" power when plugged in. TVs, computers, and chargers can use 1-10W even when "off". Smart power strips can help.
How accurate is this calculator?
Very accurate for constant-wattage devices. Variable devices (like refrigerators that cycle on/off) require averaging. Use manufacturer specifications for best results.
What affects my electricity rate?
Rates vary by location, utility company, time of use (peak/off-peak), usage tiers, and renewable energy programs. Check your bill for your exact rate.
Can I calculate costs for multiple appliances?
Yes, calculate each appliance separately then add the costs together. This helps you identify which appliances contribute most to your electricity bill.
What about energy-efficient appliances?
Energy Star and efficient appliances use significantly less power. Compare wattages when shopping - a more expensive, efficient appliance often saves money long-term through lower electricity costs.
How do I find my electricity rate?
Check your electric bill for the rate per kWh. It might be listed as "energy charge," "supply charge," or similar. Some utilities have different rates for different usage levels.