Dehumidifier Size Calculator
Enter the room area and how damp it honestly is - musty smell, window condensation, or mold spots. The calculator gives the pints-per-day rating to buy, the running watts, and what ten hours a night costs on your bill.
The rating on the box assumes a specific lab room, and basements cheat. This one scales by area and dampness, points at the 40-50 percent humidity target where mold stops and sinuses survive, and explains the window-condensation signal that winter sends every morning.
How to use
- Measure the room, not the floor plan - the machine dehumidifies one space.
- Rate the dampness honestly; mold spots mean the top bracket.
- Basements and bathrooms take one size up from the number.
Frequently asked questions
What size dehumidifier do I need for my room?
Industry ratings run about 8 pints per day for slightly damp 500 square feet, up to 16 for very damp. The calculator scales to your area and dampness - and basements deserve the next size up.
What humidity should I set my dehumidifier to?
40 to 50 percent relative humidity. Above 50 the mold and dust mites feed; below 40, wood cracks and throats complain. A unit with a humidistat stops at the target instead of running forever.
Why is my bedroom window wet in the morning?
Warm indoor air holds moisture that condenses on the cold glass overnight - breathing, drying clothes and cooking all feed it. Ventilation helps at the source; a dehumidifier closes the gap in the dampest room.
Do dehumidifiers use a lot of electricity?
A typical room unit draws 200-400 watts - about the same as the fridge it sits next to. Run ten hours a night and the calculator prices it; the humidistat keeps the real bill lower by coasting at the target.