How To Read Appliance Wattage Labels
Reference table
| W | Watts | Power draw at a moment in time |
|---|---|---|
| kW | Kilowatts | 1,000 watts |
| kWh | Kilowatt-hours | Energy used over time |
What to know
The rating plate often shows maximum input, which may be higher than average real use.
Practical guidance
Energy labels are often better for fridges, washing machines and dishwashers because they show measured kWh usage.
How to use this
For variable appliances, a plug-in energy meter gives the most practical household estimate.
FAQs
Is W the same as kWh?
No. Watts are power; kWh is energy consumed over time.
Why does my appliance use less than the label?
The label may show maximum input, not average draw.
Where is the label?
Usually on the back, underside, door edge or in the manual.
What if there are amps instead?
Power is approximately volts × amps, but use manufacturer wattage where available.
Last reviewed 3 May 2026. Source: Ofgem energy price cap. Figures are estimates. Actual prices vary by region, supplier, tariff, payment method and meter type.