Pool Dehumidification CFM Calculator
Evaporation load and airflow for an indoor pool.
Enter your values
Enter the water surface area in sq ft.
Enter the room volume in cu ft.
Choose one of: Residential (0.5), Condominium (0.65), Public pool (1.0), Wave pool (1.5).
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.
- Evaporation rate
- 80 lb/hour
- Latent load
- 84,000 BTU/h
- Ventilation at 6 ACH
- 4,000 CFM
- Outdoor air minimum
- 400 CFM
- Room pressure
- Hold slightly negative to contain chloramines
Quick answer
Indoor pool rooms are sized on water surface evaporation, typically requiring 4-8 air changes per hour.
evaporation ≈ 0.1 x area x activity factor
At a glance
| What it does | Evaporation load and airflow for an indoor pool. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Water surface area, Room volume, Activity |
| Main output | Evaporation rate |
| Formula | evaporation ≈ 0.1 x area x activity factor |
| Cost | Free — no sign-up, no download |
How to use the Pool Dehumidification CFM Calculator
- 1Measure the water surface area and the room volume.
- 2Choose the activity level — splashing raises evaporation sharply.
- 3Hold the room 2°F above water temperature and slightly negative to neighbouring spaces.
Inputs explained
- Water surface area(sq ft)
- Enter the water surface area in sq ft.
- Room volume(cu ft)
- Enter the room volume in cu ft.
- Activity
- Choose one of: Residential (0.5), Condominium (0.65), Public pool (1.0), Wave pool (1.5).
Worked example
Using the values the calculator loads with:
Inputs
- Water surface area800 sq ft
- Room volume40000 cu ft
- ActivityPublic pool (1.0)
Results
- Evaporation rate80 lb/hour
- Latent load84,000 BTU/h
- Ventilation at 6 ACH4,000 CFM
- Outdoor air minimum400 CFM
- Room pressureHold slightly negative to contain chloramines
Frequently asked questions
Why keep air warmer than water?
It slows evaporation dramatically and cuts both latent load and condensation risk.
Dehumidifier or ventilation?
A dedicated pool dehumidifier with heat recovery costs far less to run than dumping heated air outside.
What do I need to enter into the Pool Dehumidification CFM Calculator?
Just 3 values: water surface area, room volume, activity. 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 Pool Dehumidification CFM Calculator work out the answer?
Indoor pool rooms are sized on water surface evaporation, typically requiring 4-8 air changes per hour. It applies the formula evaporation ≈ 0.1 x area x activity factor and shows the working so you can check each step by hand.
Is the Pool Dehumidification CFM 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.