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?
Record programme, temperature and drying options. Replace example inputs with your own usage pattern.
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.
Quick answer
How many watts does a dishwasher use?
The rated input power is not the same as the energy used for an entire programme. A dishwasher changes its demand while heating water, circulating and drying. For a realistic result, compare the programme’s kWh per cycle when available or measure a representative cycle and then apply your electricity price.
Compare more appliances
Return to the appliance library or use the general electricity calculator for any device.
NEXT STEP
Keep exploring
Why programme energy is more useful than rated power
A dishwasher alternates between heating water, circulating, draining and drying. The heating stage can draw relatively high power, but it does not run at that level throughout the whole cycle. For that reason, kWh per programme is normally the most useful figure for estimating cost.
Eco mode can be longer and still use less energy
Longer duration does not automatically mean higher electricity use. Eco programmes often reduce heating intensity and rely on more time instead. Intensive or high-temperature programmes usually consume more because water heating is one of the largest energy demands in the cycle.
Estimate cost per cycle and per month
Use the dishwasher calculator to turn programme use into monthly cost. If your machine does not provide kWh per cycle, the appliance measurement guide explains how to obtain a more representative value.
For Spain, apply the current electricity price rather than relying only on a generic tariff.
Editorial review: 11 Oct 2026. Real consumption depends on programme, water temperature, load and drying method.
BRICODATO · PRACTICAL CHECK
Check the real energy use of your dishwasher
An Eco cycle can run longer but use less energy because water heating and drying operate differently. Use kWh per completed cycle rather than multiplying the heater wattage by programme hours. Compare similar loads and whether drying options were enabled.
Checklist to reproduce the comparison
- Record programme, temperature and drying options.
- Convert label kWh/100 cycles to kWh per cycle when applicable.
- Compare similar loads and treat water use separately.
The figures elsewhere on this page are illustrative assumptions, not a measured average for every model. Use the label, your actual cycle count and safely collected kWh readings.