Electricity Cost Calculator — Free Online Calculator
Calculate how much it costs to run any appliance. Enter watts, hours of use, and your electricity rate to find daily, monthly, and yearly costs.
How to Use This Calculator
Enter the appliance wattage (check the label or manual), how many hours per day you use it, and your electricity rate in dollars per kilowatt-hour (check your utility bill). The calculator shows your daily, monthly, and annual running costs.
The Formula Explained
Energy cost = (Watts × Hours) / 1000 × Rate. First, convert watt-hours to kilowatt-hours by dividing by 1000. Then multiply by your electricity rate. For example, a 1500W space heater running 8 hours at $0.15/kWh costs: (1500 × 8) / 1000 × $0.15 = $1.80 per day, or $54 per month.
Common Appliance Running Costs (8 hrs/day, $0.15/kWh)
| Appliance | Watts | Daily Cost | Monthly Cost |
|---|---|---|---|
| LED Bulb | 10W | $0.01 | $0.36 |
| Laptop | 65W | $0.08 | $2.34 |
| Refrigerator | 150W | $0.18 | $5.40 |
| TV (55") | 120W | $0.14 | $4.32 |
| Space Heater | 1500W | $1.80 | $54.00 |
| Window AC | 1200W | $1.44 | $43.20 |
| Clothes Dryer | 5000W | $6.00 | $180.00 |
| EV Charger (L2) | 7200W | $8.64 | $259.20 |