Convert GPM to LPM for water flow and plumbing calculations.
Convert GPM to LPM using the official US customary standard conversion factor of 1 GPM = 3.785411784 LPM.
Convert GPM to LPM for water flow and plumbing calculations.
Convert GPM to LPM using the official US customary standard conversion factor of 1 GPM = 3.785411784 LPM.
High precision needed for pump selection, pipe sizing, and irrigation design. Use precise values for all engineering applications.
Common mistake: Confusing US GPM with UK GPM. US gallons are smaller (3.785L) than UK gallons (4.546L). Using the wrong gallon type causes errors in flow calculations. Also, using approximate 3.8 LPM per GPM.
| Item | GPM | LPM |
|---|---|---|
| Shower head | 2.5 | 9.46 |
| Kitchen faucet | 2.2 | 8.33 |
| Garden hose | 10 | 37.85 |
| Fire hydrant | 500 | 1892.71 |
| Swimming pool pump | 60 | 227.12 |
GPM (Gallons per Minute) measures liquid flow rate.
Measure the time to fill a known volume container and calculate gallons per minute.
The official US customary standard defines 1 US GPM as exactly 3.785411784 LPM.
US GPM uses US gallons (3.785L), while UK GPM uses imperial gallons (4.546L). Always use US GPM for American applications.
GPM determines pipe size, pump capacity, and water pressure requirements for plumbing systems.
10 US GPM equals approximately 37.85 LPM.
Last Updated: 2026 · Reviewed by the UnitFig editorial team