Dehumidifier Sizing Calculator
Size dehumidifiers for water damage restoration based on room volume and humidity levels.
Inputs
Results
Moisture Removal
9.8 pints/day
Dehumidifiers Needed
1
How to Use This Calculator
- Enter the room area (sqft) and select the moisture condition category (wet, very wet, extremely wet).
- Review required pints/day capacity and the number of units needed based on available equipment.
- Set estimated drying days based on the IICRC S500 drying protocol for the material category.
- Check daily kWh consumption for power circuit planning (each 70-pint unit draws ~700W).
- Monitor daily moisture readings and adjust equipment quantity if drying goals are not being met.
How the result changes with Current Humidity (%RH)
| Current Humidity (%RH) | Moisture Removal | Dehumidifiers Needed |
|---|---|---|
| 37 | 0 pints/day | 1 |
| 55 | 1.4 pints/day | 1 |
| 76 | 7.3 pints/day | 1 |
| 93 | 12 pints/day | 1 |
What each input means
- Room Area (sqft)
- Floor area of the affected space in square feet
- Ceiling Height (ft)
- Height from floor to ceiling
- Current Humidity (%RH)
- Current relative humidity in the affected space
- Target Humidity (%RH)
- Target relative humidity for dry-down (typically 40-50% for restoration)
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersRoom Area (sqft) = 500, Ceiling Height (ft) = 8, Current Humidity (%RH) = 85, Target Humidity (%RH) = 50 = 4 input(s) provided
- Calculate Moisture RemovalMoisture Removal9.8 = 9.8
- Calculate Dehumidifiers NeededDehumidifiers Needed1 = 1
- Calculate Daily Energy UseDaily Energy Use36 = 36
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