Enter the flow rate and choose the conversion direction into the calculator to determine the equivalent value in liters per second (L/s) or cubic feet per minute (CFM).
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CFM to L/s Formula
The following formulas are used to convert between cubic feet per minute and liters per second.
L/s = CFM × 0.471947
CFM = L/s × 2.11888
Variables:
- L/s is the flow rate in liters per second
- CFM is the flow rate in cubic feet per minute
To convert CFM to L/s, multiply the airflow in cubic feet per minute by 0.471947. To convert L/s to CFM, multiply the airflow in liters per second by 2.11888.
What is CFM to L/s Conversion?
CFM to L/s conversion is the process of changing a volumetric flow rate from cubic feet per minute, an imperial unit, into liters per second, a metric unit. These units are commonly used in HVAC, ventilation, airflow balancing, and equipment sizing. Because both units describe volume over time, the conversion is done using a constant multiplier.
Knowing how to convert between CFM and L/s makes it easier to compare manufacturer data, design specifications, and building code requirements that may use different unit systems.
How to Calculate CFM to L/s?
The following steps outline how to calculate the equivalent flow rate.
- First, determine the airflow value you want to convert.
- Next, identify whether the value is in CFM or in L/s.
- If converting from CFM to L/s, multiply the value by 0.471947.
- If converting from L/s to CFM, multiply the value by 2.11888.
- After calculating the result, verify your answer using the calculator above.
CFM to L/s Conversion Table
The table below lists several common airflow values in CFM and their equivalent values in L/s using the formula L/s = CFM × 0.471947.
| Flow Rate (CFM) | Flow Rate (L/s) |
|---|---|
| 10 CFM | 4.72 L/s |
| 25 CFM | 11.80 L/s |
| 50 CFM | 23.60 L/s |
| 75 CFM | 35.40 L/s |
| 100 CFM | 47.19 L/s |
| 150 CFM | 70.79 L/s |
| 250 CFM | 117.99 L/s |
Different standards, product catalogs, and software tools may use either CFM or L/s. Understanding the conversion factor helps you compare airflow ratings accurately and avoid unit errors in design or field work.
Example Problem:
Use the following variables as example problems to test your knowledge.
Example 1: Flow Rate = 250 CFM
Converted Flow Rate = 117.99 L/s
Example 2: Flow Rate = 20 L/s
Converted Flow Rate = 42.38 CFM