CFM to L/s Converter
Use this CFM to L/s converter for ventilation, duct sizing, fan schedules, and air-change calculations when airflow is listed in cubic feet per minute but the target spec uses liters per second.
This page helps with searches such as cfm to l/s, cfm to liters per second, and 100 cfm to l/s when you need a fast result and a formula you can verify.
Quick examples
Common CFM to L/s reference values for quick comparison.
L/s = CFM x 0.471947
Use the declared factor above when accuracy matters. Avoid rounding midway through multi-step calculations.
Common CFM to L/s values
| CFM | L/s |
|---|---|
| 1 CFM | 0.471947 L/s |
| 2 CFM | 0.943894 L/s |
| 5 CFM | 2.359735 L/s |
| 10 CFM | 4.71947 L/s |
| 20 CFM | 9.43894 L/s |
| 50 CFM | 23.59735 L/s |
| 100 CFM | 47.1947 L/s |
| 500 CFM | 235.9735 L/s |
Where this conversion is commonly used
- Useful for HVAC submittals where fan airflow is listed in CFM and metric design tables use L/s.
- Useful for duct sizing and ventilation checks when room airflow targets need to be compared across unit systems.
- Useful for international equipment comparisons where CFM and liters per second appear on different datasheets.
Frequently asked questions
How many L/s are in 1 CFM?
1 CFM equals 0.471947 L/s using the standard conversion factor on this page.
How do you convert CFM to L/s?
Multiply the CFM value by 0.471947. For example, 100 CFM equals 47.1947 L/s.
Is CFM the same as PCM?
In many Portuguese and Spanish HVAC searches, PCM is used for cubic feet per minute. This converter uses the English CFM label for the same airflow unit.
When should I round the L/s result?
Round after conversion. Keep the full result while comparing fan schedules, ventilation targets, or duct-sizing values.