Electricity Usage Calculator
Track every appliance's electricity use. Enter watts and hours per day — get your total kWh and annual electricity cost.
| Appliance | Watts | Hrs/day | kWh/day | |
|---|---|---|---|---|
| 3.60 | ||||
| 0.50 | ||||
| 0.40 | ||||
| 0.48 | ||||
| 1.00 | ||||
| 6.00 |
How to Use This Calculator
Enter each appliance with watts and hours
The calculator starts with a typical home load — refrigerator, washing machine, TV, laptop, lighting, and air conditioner. Edit any row directly: change the appliance name, its wattage in watts, and how many hours per day it runs. Find wattage on the device nameplate, plug-in energy monitor, or the manufacturer specs. Hours per day is your average daily run time, not the hours the device is plugged in.
Add appliances from the preset list
Use the "+ Add appliance" dropdown to add common devices with pre-filled wattages. Adjust the hours to match your actual usage. For devices that cycle on and off (like refrigerators), the preset watt value already represents average draw — not peak startup watts.
Set your electricity rate
Enter your electricity rate in $/kWh. Find this on your utility bill under "energy charge" or "rate per kWh." The US average is ~$0.15/kWh but ranges from $0.09 (Louisiana) to $0.35+ (Hawaii, California, parts of New England).
The Formula
Each appliance contributes its wattage multiplied by the hours it runs per day, divided by 1,000 to convert watt-hours to kilowatt-hours. The total daily kWh is the sum across all appliances. Monthly and annual figures are simple multiplications.
Example
Average US home — default appliances, $0.15/kWh
With the default appliance list (refrigerator 24 hrs, washing machine 1 hr, TV 5 hrs, laptop 8 hrs, LED lighting 5 hrs, AC 4 hrs) at $0.15/kWh:
This is below the US average of ~10,500 kWh/year because the AC only runs 4 hrs/day. Homes in hot climates running AC 10+ hours/day will see significantly higher totals.