Watts to kWh Calculator
Convert power consumption in Watts (W) to energy in Kilowatt-hours (kWh).
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How to Convert Watts to kWh
To convert Watts to Kilowatt-hours, you need to divide the power in Watts by 1000 to get Kilowatts, and then multiply by the time in hours.
Formula
E(kWh) = (P(W) × t(h)) / 1000
Calculation Example
Question: A 100 Watt light bulb is on for 10 hours. How much energy does it use?
Answer:
E = (100 W × 10 h) / 1000 = 1 kWh
Common Appliance Energy Usage
| Appliance | Power (Watts) | Time | Energy (kWh) |
|---|---|---|---|
| LED Bulb | 10 W | 24 hours | 0.24 kWh |
| TV | 100 W | 5 hours | 0.5 kWh |
| Heater | 1500 W | 2 hours | 3.0 kWh |