Free practical tool
Dehumidifier running cost calculator.
Calculate cost per hour, session, 24 hours, month and year from the appliance wattage, active load and your own electricity rate. No email required.
Starting tariff: 26.32p/kWh. GB average, Direct Debit, 1 October–31 December 2026. Use your billed rate, not this example; the cap does not cover Northern Ireland. Standing charge is excluded and no extra VAT is added. Currency selection changes the display, not the exchange rate or local tariff. Ofgem source ↗ · tariff checked 7 October 2026.
Estimated additional electricity
The full-input ceiling is £0.05 per hour at 0.207 kWh. The 24-hour and 30-day figures assume the entered active-load percentage continues throughout; they are not a promise that a humidistat-controlled machine will draw that way. Standing charge is excluded. A suitable plug-level meter gives a better measured total.
Direct answer
Watts ÷ 1,000 × unit rate gives the full-input hourly ceiling.
At the starting 26.32p/kWh rate, a 207 W input equals 5.45p per full-input hour. Your tariff, region, payment method and meter can differ, so replace the default.
The active-load setting estimates how much of elapsed time the appliance draws its stated input. Use 100% as a conservative full-input ceiling. Humidistat cycling, fan mode, defrost and room conditions change the measured result.
For a measured answer, use a suitable plug-level electricity monitor for the complete task. Compare the same outcome—such as one dry laundry load—not an arbitrary hour.