Flow Rate Converter
L/min, L/s, m³/h, cfm and gpm for pumps, ventilation and plumbing.
Flow Rate Converter
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Units in this category
| Unit | Symbol | Exactly |
|---|---|---|
| liters per minute (L/min) | L/min | reference unit for this category |
| liters per second (L/s) | L/s | 60 L/min |
| cubic meters per hour (m³/h) | m³/h | 16.666667 L/min |
| cubic feet per minute (cfm) | cfm | 28.316847 L/min |
| US gallons per minute (gpm) | gpm | 3.785412 L/min |
| US gallons per hour (gph) | gph | 0.0630902 L/min |
Where these factors come from
Volumetric flow converts through exact volume definitions: 1 US gallon = exactly 3.785411784 L and 1 cubic foot = exactly 28.316846592 L, so cfm and gpm reduce to exact arithmetic.
All 30 flow rate pairs
| from → to | L/min | L/s | m³/h | cfm | gpm | gph |
|---|---|---|---|---|---|---|
| L/min (liters per minute) | — | 0.01666667 | 0.06 | 0.03531467 | 0.26417205 | 15.850323 |
| L/s (liters per second) | 60 | — | 3.6 | 2.11888 | 15.850323 | 951.019 |
| m³/h (cubic meters per hour) | 16.666667 | 0.27777778 | — | 0.58857778 | 4.402868 | 264.172 |
| cfm (cubic feet per minute) | 28.316847 | 0.47194744 | 1.699011 | — | 7.480519 | 448.831 |
| gpm (US gallons per minute) | 3.785412 | 0.0630902 | 0.22712471 | 0.13368056 | — | 60 |
| gph (US gallons per hour) | 0.0630902 | 0.0010515033 | 0.0037854118 | 0.0022280093 | 0.01666667 | — |
Conversions by starting unit
liters per minute (L/min)
L/min to L/sL/min to m³/hL/min to cfmL/min to gpmL/min to gph
liters per second (L/s)
L/s to L/minL/s to m³/hL/s to cfmL/s to gpmL/s to gph
cubic meters per hour (m³/h)
m³/h to L/minm³/h to L/sm³/h to cfmm³/h to gpmm³/h to gph
cubic feet per minute (cfm)
cfm to L/mincfm to L/scfm to m³/hcfm to gpmcfm to gph
US gallons per minute (gpm)
gpm to L/mingpm to L/sgpm to m³/hgpm to cfmgpm to gph
US gallons per hour (gph)
gph to L/mingph to L/sgph to m³/hgph to cfmgph to gpm
Common questions
How many gpm is 10 L/min?
About 2.64 gpm — 1 US gallon per minute is exactly 3.785411784 L/min, so divide by that factor.
Is cfm the same as m³/h?
No — 1 cfm equals about 1.699 m³/h. Both are volume per time, but the cubic foot is 28.3168 L.
Why do plumbing fixtures list both?
US manufacturers quote gpm and metric markets quote L/min. Low-flow fixtures are around 1.5 gpm ≈ 5.7 L/min.