Estimate Your Energy Costs
Wondering how much that space heater, gaming PC, or air conditioner adds to your electric bill? Our Electricity Cost Calculator helps you accurately estimate the running cost of any appliance based on its power usage and your local utility rate. Take control of your energy consumption today.
Typical Appliance Wattage
Power usage varies by model, but here are average ranges for common household devices:
| Appliance | Typical Wattage (W) | Cost per Hour (@ $0.15/kWh) |
|---|---|---|
| LED Light Bulb | 10W | $0.0015 |
| Laptop Computer | 50W - 100W | $0.007 - $0.015 |
| Fridge (Running) | 150W - 400W | $0.02 - $0.06 |
| Gaming PC | 400W | $0.06 |
| Space Heater | 1500W | $0.225 |
| Central AC | 3000W - 5000W | $0.45 - $0.75 |
Energy Saving Tips
Reduce your monthly bill with these actionable steps. For long-term financial planning, consider how inflation affects energy costs over time, especially when budgeting for major appliances. If you're considering solar panels to offset electricity costs, our solar panel calculator can help estimate potential savings and system requirements based on your current usage.
Electricity Cost Formula
Calculate the cost manually with these steps:
How to calculate electricity cost?
To calculate electricity cost, multiply the appliance's wattage by the hours used per day, then divide by 1000 to get kWh. Finally, multiply by your local electricity rate. This simple formula (Watts × Hours ÷ 1000 × Rate) works for any device, from light bulbs to air conditioners.
Frequently Asked Questions
Q:How do I calculate electricity cost per kWh?
To find the cost per kWh, check your electricity bill. Divide the total 'Generation' and 'Delivery' charges by the total kWh usage. Alternatively, most bills state the 'Rate per kWh' clearly, often between $0.10 and $0.30 depending on your location.
Q:How do I find my appliance's wattage?
Check the label on the back or bottom of the device. It will list the power usage in Watts (W). Alternatively, consult the user manual or search your model number online. For precise measurement, you can use a plug-in electricity usage monitor.
Q:What is the average electricity rate?
Rates vary significantly by region. In the US, the national average is roughly $0.16 per kWh (2024). In Europe, rates can be €0.30/kWh or higher. Check your latest utility bill for your exact rate per kWh.
Q:Does leaving a charger plugged in use electricity?
Yes, but it is minimal. Most modern chargers consume very little power (often under 0.5 Watts) when not connected to a device. However, leaving many chargers plugged in 24/7 can add up to a few dollars over a year.
Q:What uses the most electricity in a house?
Heating and cooling (HVAC) systems are typically the largest consumers, accounting for nearly 50% of home energy use. Water heaters, washers/dryers, and lighting are also major contributors.
Q:How do I calculate monthly cost?
Multiply your daily cost by 30 (or the number of days in the month). For example, if a heater costs $2.00 to run per day, it will cost roughly $60.00 per month.