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To convert watts (W) to kilowatt-hours (kWh), you need to understand the relationship between these two units.
The formula to convert watts to kilowatt-hours is:
kWh = W/1000
This formula shows that 1 kWh is equal to 1000 watts used for one hour.
Below is a table showing the conversion of various watt values to kilowatt-hours, sorted from smallest to largest.
| Watts (W) | kWh | Watts (W) | kWh | 
|---|---|---|---|
| 50.00 | 0.05 | 150.00 | 0.15 | 
| 60.00 | 0.06 | 200.00 | 0.20 | 
| 100.00 | 0.10 | 250.00 | 0.25 | 
| 120.00 | 0.12 | 300.00 | 0.30 | 
| 400.00 | 0.40 | 800.00 | 0.80 | 
| 500.00 | 0.50 | 1000.00 | 1.00 | 
| 1200.00 | 1.20 | 1400.00 | 1.40 | 
| 1440.00 | 1.44 | 1500.00 | 1.50 | 
| 1800.00 | 1.80 | 2000.00 | 2.00 | 
| 2400.00 | 2.40 | 3000.00 | 3.00 | 
| 3500.00 | 3.50 | 3600.00 | 3.60 | 
| 4000.00 | 4.00 | 4800.00 | 4.80 | 
| 12000.00 | 12.00 | 15000.00 | 15.00 | 
| 18000.00 | 18.00 | 72000.00 | 72.00 | 
To convert 400 watts to kilowatt-hours:
kWh=400/1000=0.4kWh
To convert 1000 watts to kilowatt-hours:
kWh=1000/1000=1kWh
To convert 1500 watts to kilowatt-hours:
kWh=1500/1000=1.5kWh