Convert Liters per Second to Cubic Feet per Minute
1 liter per second (L/s) equals 2.118880003 cubic feet per minute (CFM).
1 L/s = 2.118880003 CFM
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk liter per second to cubic foot per minute converter to paste a column from Excel.
How to Convert Liter per Second to Cubic Foot per Minute
- 1 L/s = 2.118880003 CFM
- 1 CFM = 0.4719474432 L/s
- Example: convert 15 L/s to CFM: 15 L/s = 15 × 2.118880003 CFM = 31.78320005 CFM
Formula
CFM = L/s × 2.118880003289
Derivation from SI units:
- 1 L/s = 10⁻³ m³ ÷ 1 s
- 1 CFM = (0.3048 m)³ ÷ 60 s = 4.719474432 × 10⁻⁴ m³/s
- 1 L/s = 0.001 m³/s ÷ 0.0004719474432 m³/s per CFM = 2.118880003289 CFM
Both units are defined exactly, so the factor is exact. Liter per Second definition: liter per second; Cubic Foot per Minute definition: cubic foot per minute.
Worked examples
- A ventilation rate of 10 L/s per person is 21.18880003 CFM.
10 L/s × 2.118880003 = 21.18880003 CFM - An extract fan rated 50 L/s moves 105.9440002 CFM.
50 L/s × 2.118880003 = 105.9440002 CFM
Liter per Second to Cubic Foot per Minute conversion table
| Liters per Second (L/s) | Cubic Feet per Minute (CFM) |
|---|---|
| 0.1 L/s | 0.2118880003 CFM |
| 0.5 L/s | 1.059440002 CFM |
| 1 L/s | 2.118880003 CFM |
| 2 L/s | 4.237760007 CFM |
| 2.5 L/s | 5.297200008 CFM |
| 5 L/s | 10.59440002 CFM |
| 7.5 L/s | 15.89160002 CFM |
| 10 L/s | 21.18880003 CFM |
| 15 L/s | 31.78320005 CFM |
| 20 L/s | 42.37760007 CFM |
| 25 L/s | 52.97200008 CFM |
| 50 L/s | 105.9440002 CFM |
| 75 L/s | 158.9160002 CFM |
| 100 L/s | 211.8880003 CFM |
| 250 L/s | 529.7200008 CFM |
| 500 L/s | 1059.440002 CFM |
| 1000 L/s | 2118.880003 CFM |
Where it's used
Ventilation designs in L/s per person (EN 16798, AS 1668) are converted to CFM for US equipment selection and comparison with ASHRAE 62.1.
Liter per Second to other flow rate units
| Conversion | 1 L/s equals |
|---|---|
| liter per second to cubic meter per second | 0.001 m³/s |
| liter per second to cubic meter per hour | 3.6 m³/h |
| liter per second to liter per minute | 60 L/min |
| liter per second to cubic centimeter per second | 1000 cm³/s |
| liter per second to cubic centimeter per minute | 60000 cm³/min |
| liter per second to sccm | 60000 sccm |
| liter per second to SLPM | 60 SLPM |
| liter per second to cubic foot per minute | 2.118880003 CFM |
| liter per second to US gallon per minute | 15.85032314 GPM |
Frequently asked questions
How many CFM is 1 L/s?
1 L/s = 2.118880003 CFM.
How many cubic feet per minute are in 1 liter per second?
1 L/s = 2.118880003 CFM.
How do I convert liters per second to cubic feet per minute?
Multiply the value in L/s by 2.118880003. For example, 15 L/s × 2.118880003 = 31.78320005 CFM.
Is the L/s to CFM conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 (litre).
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "cubic foot per minute (ft³/min)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Liters per Second to Cubic Feet per Minute. Retrieved October 17, 2026, from https://scientificconverters.com/flow-rate/liters-per-second-to-cubic-feet-per-minute/
IEEE
Scientific Converters, "Convert Liters per Second to Cubic Feet per Minute," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/flow-rate/liters-per-second-to-cubic-feet-per-minute/