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 coffee machine use?
Start with a transparent example, then replace the assumptions with your own wattage, operating time and electricity price.
0.30 kWhper day of use
1.80 €per month at 0.20 €/kWh
Worked example
1200 W × 0.25 h/day × 100 % load factor × 30 days.
9.00 kWh/month · 21.60 €/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 |
|---|---|
| Pod / compact | 900–1,500 W |
| Espresso machine | 1,200–1,700 W |
| Bean-to-cup / larger | 1,300–1,900 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
- Switch off long keep-warm periods if you do not need them.
- Descale as recommended so heating remains efficient.
- Count real heating minutes rather than leaving the rated wattage active all day.
Compare more appliances
Return to the appliance library or use the general electricity calculator for any device.
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