Laundry Room Ventilation Calculator
Exhaust airflow for a laundry room.
Enter your values
Enter the laundry room area in sq ft.
Enter the ceiling height in ft.
Choose one of: Residential, Multi-family shared laundry.
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.
- General exhaust
- 105 CFM
- Air changes per hour
- 11.25
- Rate used
- 1.5 CFM/sq ft
- Note
- Dryer exhaust is separate ducted airflow, sized independently
Quick answer
Laundry rooms are typically ventilated at 1-2 CFM per square foot, or roughly 10-12 air changes per hour, on top of any dedicated dryer duct.
CFM = area x rate (independent of dryer exhaust duct)
At a glance
| What it does | Exhaust airflow for a laundry room. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Laundry room area, Ceiling height, Usage level |
| Main output | General exhaust |
| Formula | CFM = area x rate (independent of dryer exhaust duct) |
| Cost | Free — no sign-up, no download |
How to use the Laundry Room Ventilation Calculator
- 1Enter the laundry room area and ceiling height.
- 2Choose residential or shared multi-family use.
- 3Remember this is general room exhaust, not the dedicated dryer vent duct.
Inputs explained
- Laundry room area(sq ft)
- Enter the laundry room area in sq ft.
- Ceiling height(ft)
- Enter the ceiling height in ft.
- Usage level
- Choose one of: Residential, Multi-family shared laundry.
Worked example
Using the values the calculator loads with:
Inputs
- Laundry room area70 sq ft
- Ceiling height8 ft
- Usage levelResidential
Results
- General exhaust105 CFM
- Air changes per hour11.25
- Rate used1.5 CFM/sq ft
- NoteDryer exhaust is separate ducted airflow, sized independently
Frequently asked questions
Does this replace the dryer vent?
No — the dryer must always have its own dedicated smooth duct to outside, this figure is for general room air.
Why ventilate at all if the dryer vents outside?
Washers add humidity and lint/detergent fumes that still need general dilution.
What do I need to enter into the Laundry Room Ventilation Calculator?
Just 3 values: laundry room area, ceiling height, usage level. 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 Laundry Room Ventilation Calculator work out the answer?
Laundry rooms are typically ventilated at 1-2 CFM per square foot, or roughly 10-12 air changes per hour, on top of any dedicated dryer duct. It applies the formula CFM = area x rate (independent of dryer exhaust duct) and shows the working so you can check each step by hand.
Is the Laundry Room Ventilation 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.