CFM to L/s Calculator
Convert CFM to litres per second.
Enter your values
Enter the airflow in CFM.
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.
- Airflow
- 70.79 L/s
- In m³/h
- 254.9
- In m³/s
- 0.0708
- In CFM
- 150
Working
- 1150 CFM x 0.471947 = 70.79 L/s
Quick answer
One CFM equals 0.471947 litres per second.
L/s = CFM x 0.471947
At a glance
| What it does | Convert CFM to litres per second. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Airflow |
| Main output | Airflow |
| Formula | L/s = CFM x 0.471947 |
| Cost | Free — no sign-up, no download |
How to use the CFM to L/s Calculator
- 1Enter the CFM rating you want to convert.
- 2Read litres per second for code compliance checks.
- 3Use m³/h when sizing metric ducting.
Inputs explained
- Airflow(CFM)
- Enter the airflow in CFM.
Worked example
Using the values the calculator loads with:
Inputs
- Airflow150 CFM
Results
- Airflow70.79 L/s
- In m³/h254.9
- In m³/s0.0708
- In CFM150
- 150 CFM x 0.471947 = 70.79 L/s
Frequently asked questions
Why is L/s used in codes?
It scales neatly for per-person and per-square-metre ventilation rates.
What is a typical bathroom rate?
Many codes ask for 15 L/s intermittent, about 32 CFM, or 8 L/s continuous.
What do I need to enter into the CFM to L/s Calculator?
Just 1 value: airflow. 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 CFM to L/s Calculator work out the answer?
One CFM equals 0.471947 litres per second. It applies the formula L/s = CFM x 0.471947 and shows the working so you can check each step by hand.
Is the CFM to L/s 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.