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 dehumidifier use?
Log initial and final relative humidity with a separate hygrometer. Replace example inputs with your own usage pattern.
1.44 kWhper day of use
8.64 €per month at 0.20 €/kWh
Worked example
300 W × 8 h/day × 60 % load factor × 30 days.
43.20 kWh/month · 103.68 €/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 |
|---|---|
| Small compressor unit | 180–300 W |
| Typical domestic unit | 250–450 W |
| Large / high-capacity unit | 400–700+ 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
- Use a realistic humidity target rather than forcing the unit to run continuously.
- Close windows and doors while dehumidifying a room.
- Clean filters and check water drainage.
Compare more appliances
Return to the appliance library or use the general electricity calculator for any device.
NEXT STEP
Keep exploring
Humidity target and room conditions control runtime
A dehumidifier's rated wattage does not tell you how many hours the compressor will actually run. Once the room approaches the selected humidity target, many units cycle or reduce operation. The monthly result therefore depends on moisture load as much as on electrical power.
Room temperature changes performance
Compressor dehumidifiers generally remove water differently at lower room temperatures than under warmer test conditions. Open windows, drying laundry indoors, damp walls and repeated moisture entry can also keep the unit running for longer.
Do not use energy cost to hide the source of damp
A dehumidifier can control indoor humidity, but it does not repair a leak or water ingress. If the moisture source is unclear, read how to control humidity at home before assuming continuous dehumidification is the solution.
Use the dehumidifier calculator for your own wattage and runtime, and check the current electricity price if you are in Spain.
Editorial review: 11 Oct 2026. Extraction ratings and real energy use depend on temperature and humidity conditions.
BRICODATO · PRACTICAL CHECK
Check the real energy use of your dehumidifier
Advertised litres per day depend on specified test conditions and may differ substantially in a cool room. Compare electricity use against the amount of moisture removed and the humidity target achieved. Running hours alone miss compressor cycling and room conditions.
Checklist to reproduce the comparison
- Log initial and final relative humidity with a separate hygrometer.
- Compare runs at a similar room temperature and water load.
- Separate the first drying period from maintenance operation.
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.