Energy Consumption Calculator
Calculate energy usage for single or multiple appliances. Estimate daily, monthly and annual power consumption in kWh.
Energy Calculator
Watts (W)
Units
Hours/Day
Energy Consumed per Day:
0 kWh
Energy Consumed per Month:
0 kWh
Energy Consumed per Year:
0 kWh
Calculation Information
Electric energy consumption is calculated using the formula:
Energy (kWh) = Power (W) × Quantity × Time (hours) / 1000
Where:
- E = Energy in kilowatt-hours (kWh)
- P = Power in watts (W)
- Q = Number of units (Quantity)
- t = Time in hours
Important: 1 kWh = 1 Unit of electricity (as per electricity bills)
Examples with Quantity:
5 × 25W LED Bulbs used 6 hours daily:
Daily = (25 × 5 × 6) / 1000 = 0.75 kWh
Monthly = 0.75 × 30 = 22.5 kWh
3 × 80W Fans used 8 hours daily:
Daily = (80 × 3 × 8) / 1000 = 1.92 kWh
Monthly = 1.92 × 30 = 57.6 kWh
Common Appliance Wattage:
| Appliance | Power (Watts) | Typical Quantity |
|---|---|---|
| LED Light Bulb | 5-25W | 10-20 per home |
| Ceiling Fan | 60-80W | 3-6 per home |
| Laptop | 50-100W | 1-3 per home |
| Refrigerator | 100-250W | 1-2 per home |
| Television | 50-200W | 2-4 per home |
| Air Conditioner | 800-1500W | 1-4 per home |
