What Size Dehumidifier Do I Need?
What pint capacity do you actually need?
Quick Answer
For a moderately damp room of 500 square feet, you need a 30-pint dehumidifier. Very damp or wet spaces need 40–50 pints. Basements over 1,000 sq ft typically require a 50–70 pint unit. The right size runs fewer hours and costs less to operate than an undersized unit working overtime.
Citation-ready summary
Summary
For a moderately damp room of 500 square feet, you need a 30-pint dehumidifier. Very damp or wet spaces need 40–50 pints. Basements over 1,000 sq ft typically require a 50–70 pint unit. The right size runs fewer hours and costs less to operate than an undersized unit working overtime.
Formula
Cost = (watts ÷ 1,000) × hours used × electricity rate per kWh.
Data used
Calculator results use user-entered wattage and usage hours, combined with residential electricity rates from the selected country or state.
Sources
Limits
These are estimates, not exact utility bills. Actual costs depend on your tariff, taxes, appliance cycling, efficiency, and how you use the appliance.