Watts to kWh
kWh = (W ÷ 1,000) × hours × load factor. Multiply kWh by your electricity price to estimate energy cost.
📺 Worked example
How much electricity does a television use?
Start with a transparent example, then replace the assumptions with your own wattage, operating time and electricity price.
0.40 kWhper day of use
2.40 €per month at 0.20 €/kWh
Worked example
100 W × 4 h/day × 100 % load factor × 30 days.
12.00 kWh/month · 28.80 €/year
This is an energy-only estimate. Your bill can also include standing charges, taxes and other household consumption.
Typical reference range
Use the label, manual or manufacturer data for your exact model whenever possible.
| Type or situation | Indicative reference |
|---|---|
| Small efficient TV | 30–70 W |
| Typical 50–55 inch TV | 70–140 W |
| Large / very bright TV | 120–250+ W |
What changes the result?
Rated watts are only one part of the calculation.
Measure when possible
Thermostats, compressors, inverter control and programmes can make real consumption lower or higher than a simple maximum-power estimate.
Practical checks
- Brightness and HDR use can change power draw.
- Disable unnecessary high-brightness shop modes.
- Standby is usually small but can be measured over several days.
Compare more appliances
Return to the appliance library or use the general electricity calculator for any device.
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