CFM to L/s Calculator
Convert CFM to litres per second.
Enter your values
ⓘ Live results
Results
- 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
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.
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.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.