Unit converter
Liquid flow converter
Convert liquid flow between GPM, L/min, L/s, and m3/h for pumps, fixtures, and hydronic loops.
Quick answer
1 GPM = 3.78541 L/min. 1 GPM = 0.227125 m3/h.
Common liquid flow conversions
| Unit | L/min | m3/h |
|---|---|---|
| 1 GPM | 3.78541 | 0.227125 |
| 1 L/min | 1 | 0.06 |
| 1 L/s | 60 | 3.6 |
| 1 m3/h | 16.6667 | 1 |
| 1 GPH | 0.0630902 | 0.00378541 |
About this converter
Convert liquid flow between GPM, L/min, L/s, and m3/h for pumps, fixtures, and hydronic loops. It runs in your browser and works offline, so you can convert on the truck or in the field with no signal.
Common on Plumbing and HVAC work.
Calculators that use liquid flow
ACH to CFM calculatorFind the airflow for a target air change rate: CFM = room volume x ACH / 60, from floor area and ceiling height.Affinity laws calculatorScale fan or pump flow, pressure, and power for a speed change using the affinity laws: flow with speed, pressure with the square, power with the cube.Duct airflow calculatorSolve duct airflow and velocity from the duct size using continuity (Q = V x A): enter a round or rectangular duct and either the CFM or the velocity, and get the other.Hydronic load calculatorFind the heat load of a hydronic loop from flow and temperature difference: BTU/hr = GPM x 500 x delta-T, and tons = GPM x delta-T / 24.
Liquid flow conversion FAQ
How do you convert GPM to L/min?
Multiply by 3.78541: 1 GPM = 3.78541 L/min. To convert back, 1 L/min = 0.264172 GPM.
How do you convert GPM to m3/h?
Multiply by 0.227125: 1 GPM = 0.227125 m3/h. To convert back, 1 m3/h = 4.40287 GPM.