Watt to unit (kWh) calculator
1 unit of electricity is 1 kWh: 1,000 watts for one hour. Type the watts and the hours. The tool gives the units, and the cost at your state’s rate.
- 1 unit = 1 kWh
- Watts, kW and hours
- Cost at your state’s rate
Work out the units
Units, kWh and watts
| This | Equals |
|---|---|
| 1 unit | 1 kWh |
| 1 kWh | 1,000 Wh |
| 1,000 watts for 1 hour | 1 unit |
| 100 watts for 10 hours | 1 unit |
| 1 watt for 1,000 hours | 1 unit |
| 1 kW for 1 hour | 1 unit |
| 1 MWh | 1,000 units |
The formula
Units = watts × hours a day × days ÷ 1,000
Watts is the power on the appliance label. If the label shows kW, multiply by 1,000 first. Kilowatt-hours (kWh) and units are the same thing.
Units for common appliances
| Appliance | Watts | Hours a day | Units in 30 days |
|---|---|---|---|
| LED bulb | 9 | 6 | 1.6 |
| Ceiling fan | 75 | 12 | 27.0 |
| BLDC fan | 30 | 12 | 10.8 |
| Refrigerator (average) | 100 | 24 | 72.0 |
| Television | 100 | 5 | 15.0 |
| Laptop | 50 | 6 | 9.0 |
| Mixer grinder | 750 | 0.5 | 11.2 |
| Iron | 1,000 | 0.5 | 15.0 |
| Water heater (geyser) | 2,000 | 1 | 60.0 |
| 1.5 ton AC (average) | 1,300 | 8 | 312.0 |
Typical ratings. Check the label on your appliance. A fridge and an AC switch on and off, so these use average watts.
Questions
How many watts is 1 unit of electricity?
1 unit is 1 kilowatt-hour (kWh): 1,000 watts for one hour. A 100-watt load uses 1 unit in 10 hours.
Is 1 unit the same as 1 kWh?
Yes. The unit on your electricity bill is one kilowatt-hour.
How do I change watts to units?
Units = watts × hours ÷ 1,000. For many days, multiply by the number of days. Example: 2,000 W × 1 hour × 30 days ÷ 1,000 = 60 units.
How do I change kWh to rupees?
Multiply the units by your rate a unit. The best rate to use is your bill total divided by the units on the bill. It includes the fixed charge and the other lines.