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 dishwasher use?
Start with a transparent example, then replace the assumptions with your own wattage, operating time and electricity price.
0.89 kWhper day of use
5.33 €per month at 0.20 €/kWh
Worked example
1850 W × 1.2 h/day × 40 % load factor × 30 days.
26.64 kWh/month · 63.94 €/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 eco programme | ≈0.6–0.9 kWh/cycle |
| Normal programme | ≈0.8–1.2 kWh/cycle |
| Intensive / high temperature | ≈1.2–1.8+ kWh/cycle |
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
- Use eco mode when time is not critical.
- Run full loads rather than repeated half loads.
- Clean filters and spray arms so the programme can work as intended.
Compare more appliances
Return to the appliance library or use the general electricity calculator for any device.
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