Indoor Pool Dehumidification Calculator
Moisture load and dehumidifier CFM for an indoor pool.
Enter your values
Enter the pool surface area in sq ft.
Choose one of: Calm, unoccupied, Recreational swimming, Active/whirlpool/waterpark.
Enter the air-water temp difference in F.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Estimated evaporation
- 117 lb/hr
- Equivalent moisture load
- 15.62 gal/hr
- Approx dehumidifier airflow
- 2,925 CFM
Quick answer
Indoor pool evaporation rate depends on water surface area, activity level and the air-to-water temperature difference.
Evaporation (lb/hr) = A x (Pw - Pa) x (0.089 + 0.0782 V) / Y
At a glance
| What it does | Moisture load and dehumidifier CFM for an indoor pool. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Pool surface area, Activity level, Air-water temp difference |
| Main output | Estimated evaporation |
| Formula | Evaporation (lb/hr) = A x (Pw - Pa) x (0.089 + 0.0782 V) / Y |
| Cost | Free — no sign-up, no download |
How to use the Indoor Pool Dehumidification Calculator
- 1Measure the pool's water surface area.
- 2Choose the typical activity level of the space.
- 3Use the estimated evaporation rate to size a pool dehumidification unit.
Inputs explained
- Pool surface area(sq ft)
- Enter the pool surface area in sq ft.
- Activity level
- Choose one of: Calm, unoccupied, Recreational swimming, Active/whirlpool/waterpark.
- Air-water temp difference(F)
- Enter the air-water temp difference in F.
Worked example
Using the values the calculator loads with:
Inputs
- Pool surface area800 sq ft
- Activity levelRecreational swimming
- Air-water temp difference5 F
Results
- Estimated evaporation117 lb/hr
- Equivalent moisture load15.62 gal/hr
- Approx dehumidifier airflow2,925 CFM
Frequently asked questions
Why does activity level matter so much?
Splashing and moving water dramatically increases the exposed surface area for evaporation.
Do covers help?
Pool covers when not in use can cut evaporation and dehumidification load by 50-90%.
What do I need to enter into the Indoor Pool Dehumidification Calculator?
Just 3 values: pool surface area, activity level, air-water temp difference. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Indoor Pool Dehumidification Calculator work out the answer?
Indoor pool evaporation rate depends on water surface area, activity level and the air-to-water temperature difference. It applies the formula Evaporation (lb/hr) = A x (Pw - Pa) x (0.089 + 0.0782 V) / Y and shows the working so you can check each step by hand.
Is the Indoor Pool Dehumidification Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.