Dehumidifier Size Calculator
Pints per day for a room or whole home.
Enter your values
Enter the floor area in sq ft.
Choose one of: Slightly damp, Moderately damp, Very damp, Wet / standing water.
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.
- Recommended capacity
- 25 pints/day
- Raw requirement
- 20 pints/day
- In litres/day
- 9.5
- Suggested airflow
- 420 CFM circulation
Quick answer
Dehumidifier capacity scales with floor area and how damp the space is, from lightly damp to wet.
pints/day ≈ area x factor for dampness level
At a glance
| What it does | Pints per day for a room or whole home. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Floor area, Dampness |
| Main output | Recommended capacity |
| Formula | pints/day ≈ area x factor for dampness level |
| Cost | Free — no sign-up, no download |
How to use the Dehumidifier Size Calculator
- 1Measure the floor area you want to dry.
- 2Pick the dampness level that matches the smell and feel of the space.
- 3Round up to the next standard capacity and allow free airflow around the unit.
Inputs explained
- Floor area(sq ft)
- Enter the floor area in sq ft.
- Dampness
- Choose one of: Slightly damp, Moderately damp, Very damp, Wet / standing water.
Worked example
Using the values the calculator loads with:
Inputs
- Floor area1200 sq ft
- DampnessSlightly damp
Results
- Recommended capacity25 pints/day
- Raw requirement20 pints/day
- In litres/day9.5
- Suggested airflow420 CFM circulation
Frequently asked questions
Basement sizing?
Basements usually fall into moderately or very damp, so size up rather than down.
Whole-house units?
A ducted 70-100 pint unit tied into the return handles most homes.
What do I need to enter into the Dehumidifier Size Calculator?
Just 2 values: floor area, dampness. 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 Dehumidifier Size Calculator work out the answer?
Dehumidifier capacity scales with floor area and how damp the space is, from lightly damp to wet. It applies the formula pints/day ≈ area x factor for dampness level and shows the working so you can check each step by hand.
Is the Dehumidifier Size 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.