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 refrigerator use?
Start with a transparent example, then replace the assumptions with your own wattage, operating time and electricity price.
1.01 kWhper day of use
6.05 €per month at 0.20 €/kWh
Worked example
120 W × 24 h/day × 35 % load factor × 30 days.
30.24 kWh/month · 72.58 €/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 |
|---|---|
| Efficient modern fridge | 80–120 W while compressor runs |
| Typical fridge-freezer | 100–180 W while compressor runs |
| Large / American style | 150–300+ W while compressor runs |
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
- Do not estimate from rated watts multiplied by 24 hours at 100 %.
- Keep ventilation around the appliance clear.
- Use annual kWh from the energy label when available.
Compare more appliances
Return to the appliance library or use the general electricity calculator for any device.
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