Dehumidifier running-cost calculator
Work out how much it costs to run a dehumidifier, from its power rating, usage and your electricity price.
Result
Cost per year
Cost per week
How to use this tool
- Check the unit's power label or manual; the prefilled wattage is an example, not a model-specific value.
- Enter how many hours a day and days a week you run it.
- Enter your electricity price per kWh.
- Read the estimated cost per week and per year.
Assumptions
- Assumes the unit runs at full rated power the whole time it's on — many dehumidifiers cycle off once the target humidity is reached, so real usage is often lower.
Technical details: what the fields mean
- Dehumidifier power
powerWatts - Rated power from the specific unit's label or manual; the prefilled value is illustrative.
- Hours per day
hoursPerUse - How many hours a day it actually runs.
- Days per week
daysPerWeek - How many days a week you use it.
- Electricity price
pricePerKwh - Your electricity price per kWh.
Methodology
Energy per week = power (kW) × hours per day × days per week. Weekly cost = energy × your entered electricity price per kWh; the yearly estimate repeats that weekly use for 52 weeks. Costs are displayed in GBP (£), with no live tariff lookup or currency conversion.
Worked example
300W unit, 6 hours/day, 7 days/week, 27p/kWh
Inputs: Dehumidifier power: 300 W, Hours per day: 6 hours, Days per week: 7, Electricity price: £0.27/kWh
Result: £3.40/week, £176.80/year
Practical guidance
- A humidistat setting (running until a target humidity is reached, then stopping) cuts real running time well below 'hours switched on'.
- Enter the hours the unit actually runs rather than only the time it is switched on; humidity controls may cycle the compressor.
Common mistakes
- Assuming the unit runs continuously at full power for the whole time it's switched on, when most cycle off once the target humidity is reached.
FAQs
Does the estimate include other running costs?
No. It estimates electricity usage only; purchase, filter, maintenance and standing-charge costs are not included.
Last reviewed: 2026-10-11
Assumes full rated power is drawn for all entered hours. A humidistat-controlled unit may cycle, so measured average use can be lower.
This tool provides an indicative estimate, based on the assumptions stated above.
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