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 washing machine use?
Start with a transparent example, then replace the assumptions with your own wattage, operating time and electricity price.
1.05 kWhper day of use
6.30 €per month at 0.20 €/kWh
Worked example
2100 W × 1 h/day × 50 % load factor × 30 days.
31.50 kWh/month · 75.60 €/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 |
|---|---|
| Efficient eco cycle | ≈0.4–0.7 kWh/cycle |
| Typical warm wash | ≈0.6–1.0 kWh/cycle |
| Hot / intensive cycle | ≈1.0–2.0+ 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 the energy label or kWh per cycle where available.
- Lower wash temperatures usually reduce energy used for heating water.
- Run fuller loads within the manufacturer limit.
Compare more appliances
Return to the appliance library or use the general electricity calculator for any device.
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