Dehumidifier Calculator
Calculate how many dehumidifiers are required for a drying porject!
This Dehumidifier Calculator will help you determine how many dehumidifiers are required on a drying project. This is important so we can achieve balanced drying!
How to Use the Dehumidifier Calculator
Follow these steps to calculate how many dehumidifiers you need:
1️⃣ Select the Dehumidifier Type
→ Choose Conventional, LGR, or Desiccant based on your equipment.
2️⃣ Enter the Drying Chamber Dimensions
→ Input the Length, Width, and Height (in feet).
3️⃣ Select the Class of Water Damage
✔ Class 1 – Affects less than 5% of surfaces (minimal absorption).
✔ Class 2 – Affects 5% to 40% of surfaces (moisture in materials).
✔ Class 3 – Affects more than 40% of surfaces (water saturates walls, ceilings, etc.).
✔ Class 4 – Deeply saturated materials like hardwood, plaster, or concrete (requires special drying methods).
4️⃣ Enter the Dehumidifier Rating
→ For Refrigerant: Enter the pints per day (PPD) AHAM rating.
→ For Desiccant: Enter the CFM rating.
5️⃣ Click “Calculate”
→ View the results instantly! The calculator will tell you:
✔ PPD or CFM Required
✔ Number of Dehumidifiers Needed (Rounded Up)
🛠 Need Help?
Learn more about dehumidifiers here.
Dehumidifier Calculator
Calculate how many dehumidifiers are needed!
Results
PPD Required:
CFM:
Dehumidifiers Required:
Dehumidifier Factor Chart
| Dehumidifier Type | Class 1 | Class 2 | Class 3 | Class 4 |
|---|---|---|---|---|
| Conventional Refrigerant | 100 | 40 | 30 | N/A |
| Low Grain Refrigerant (LGR) | 100 | 50 | 40 | 40 |
| Desiccant (Air Changes per Hour) | 1 ACH | 2 ACH | 3 ACH | 3 ACH |
ACH = Air Changes Per Hour
CFM = Cubic Feet Per Minute
These results are for informational purposes. We do not guarantee or warranty the accuracy of these results. Based on the IICRC "Initial Dehumidification Recommendation Factors and Formulas" Chart.