Dehumidifier Time-to-Dry Calculator

Estimate how long it may take a dehumidifier to reach your target RH based on room size, conditions, and capacity.

Results are estimates and intentionally shown as a range, because real homes have leakage and wet materials.
Cold temperatures and high air exchange can reduce effective performance.
If RH keeps rising, you likely have a continuous moisture source that must be addressed.

Inputs

Unit System

Temperature Unit

Floor Area

m²

Ceiling Height

Current RH

Target RH

Indoor Temperature

°C

Capacity Unit

Dehumidifier Rated Capacity

L/day

Air Exchange / Leakage

Continuous Moisture Source

Need More Capacity?

Estimated Time Range

—

Assumptions Summary

Calculation Details

Show intermediate values

Water to remove: —

Effective removal rate: —

Internally, units are converted to SI. Capacity is reduced using conservative derating factors for temperature, leakage, and continuous moisture sources.
The “water to remove” is estimated using a simple empirical coefficient to represent air and moisture buffering by materials.
Because real conditions vary widely, this tool outputs a range, not a single number.