Work out dehumidifier sizing instantly with clear inputs, formula shown and shareable results.
Dehumidifier capacity is quoted in pints of water removed per day and is sized from floor area banded by how damp the space is: roughly 10 pints per 500 ft² for a musty space, 14 for visible damp and 18 where there is seepage. Ceiling height scales the result because the moisture load follows the air volume.
Moisture load
pints/day = (area / 500) x dampness rate x (ceiling height / 8)
Metric
L/day = pints/day x 0.4732
pints/day = (area / 500) x dampness rate x (ceiling height / 8). Dehumidifier capacity is quoted in pints of water removed per day and is sized from floor area banded by how damp the space is: roughly 10 pints per 500 ft² for a musty space, 14 for visible damp and 18 where there is seepage.
Yes. Capacity ratings assume free air movement and about 65 percent relative humidity at 80 °F. A cold basement or a unit boxed into a corner delivers considerably less than nameplate.
This calculator takes 3 inputs: Floor area, Ceiling height, Dampness level. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.