Tool
Dehumidifier Size Calculator
Two taps, room size and how damp it feels, and you get a pint capacity that lines up with the current DOE test standard on the box.
Your space
How damp is it?
Your recommendation
Pick a room size and dampness level, and the recommended pint capacity shows up here.
The pint number on a dehumidifier box is how much water it can pull from the air in 24 hours under standard test conditions. Bigger rooms and damper conditions push the size up, and a unit with headroom cycles less, runs quieter, and usually reaches your target humidity faster than one straining at its limit.
One thing that trips people up: the test standard changed in 2019. Older units were rated under warmer, wetter test conditions, so a pre-2019 "50 pint" is roughly a 30 to 35 pint under today's DOE rating. If you are comparing against an older model number, the numbers are not directly comparable.
Whatever size you land on, the tank fills faster than most people expect in a genuinely damp space. Plan to empty it daily at first, or better, set the unit near a floor drain and use the drain hose so it can run continuously without babysitting.
A dehumidifier treats the symptom
If a room is wet because of a leak, drainage problem, or groundwater, a dehumidifier helps but does not fix the source. Sizing here is guidance, a pro can confirm what is feeding the moisture.
Running a dehumidifier around the clock and still damp? That usually points to a moisture source worth tracing.
Find a local mold pro