Liter per Second to Cubic Foot per Minute (LPS to CFM)
Convert LPS to CFM — Flow Rate converter
One liter per second equals 2.11888 CFM, so to convert liters per second to cubic feet per minute you multiply the value by 2.11888. A liter per second is larger than a cubic foot per minute — going the other way, 1 CFM = 0.47194744 LPS. For example, 10 LPS = 21.1888 CFM and 50 LPS = 105.944 CFM.
1 LPS = 2.11888 CFM
Liter per Second to Cubic Foot per Minute formula
1 Liter per Second = 2.11888 CFM
Worked examples
- 25 LPS = 52.972 CFM
- 100 LPS = 211.888 CFM
Liter per Second to Cubic Foot per Minute conversion table
| Liter per Second (LPS) | Cubic Foot per Minute (CFM) |
|---|---|
| 1 | 2.11888 |
| 2 | 4.23776 |
| 3 | 6.35664 |
| 5 | 10.5944 |
| 8 | 16.95104 |
| 10 | 21.1888 |
| 12 | 25.42656 |
| 15 | 31.7832 |
| 20 | 42.3776 |
| 25 | 52.972 |
| 50 | 105.944 |
| 100 | 211.888 |
| 250 | 529.720001 |
| 500 | 1059.44 |
| 1000 | 2118.88 |
Which gallon, and which trade
The single most expensive mistake in flow conversion is the gallon. A US liquid gallon is 3.785411784 litres; an imperial gallon is 4.54609 litres. US GPM and imperial GPM differ by about 20%, and pump datasheets frequently do not say which one they mean. Check the manufacturer's country of origin before trusting a GPM figure.
Different trades default to different units for the same physical quantity: HVAC and compressed air work in CFM, plumbing and pumps in GPM or LPM, and process and water engineering in m³/h or L/s. A specification that mixes them is usually quoting different equipment, not different flows. On this page, 1 LPS = 2.11888 CFM.
CFM to metric is worth memorising: one cubic foot is exactly 0.028316846592 m³, so 1 CFM = 1.699011 m³/h and 1,000 CFM ≈ 1,699 m³/h. Note that CFM on a compressor may be quoted as free air delivery (FAD) at inlet conditions rather than at working pressure — the two are not interchangeable.
Frequently asked questions
How many cubic feet per minute are in one liter per second?
One liter per second equals 2.11888 cubic feet per minute (CFM).
How many liters per second are in one cubic foot per minute?
One cubic foot per minute equals 0.47194744 liters per second (LPS).
How do you convert liters per second to cubic feet per minute?
1 Liter per Second = 2.11888 CFM. Use the calculator above for any value.
What is 5 LPS in CFM?
5 LPS = 10.5944 CFM.
What is 100 LPS in CFM?
100 LPS = 211.888 CFM.
What is 10 LPS in CFM?
10 LPS = 21.1888 CFM.
What is 20 LPS in CFM?
20 LPS = 42.3776 CFM.
What is 50 LPS in CFM?
50 LPS = 105.944 CFM.
What is 500 LPS in CFM?
500 LPS = 1059.44 CFM.
Is a liter per second bigger than a cubic foot per minute?
Yes. A liter per second is larger — one liter per second equals 2.11888 cubic feet per minute (CFM).