Calculator
Designed for irrigation planning and garden flow checks.
History is saved locally in your browser session.
Example data
| Flow (GPM) | US basis (LPM) | Imperial basis (LPM) |
|---|---|---|
| 5 | 18.927 | 22.730 |
| 10 | 37.854 | 45.461 |
| 15 | 56.781 | 68.191 |
These examples assume steady flow and clean measurement.
Formula used
This converter uses a constant liters-per-gallon factor based on your selected gallon type. One minute is already built into both units.
- LPM = GPM × (liters per gallon)
- GPM = LPM ÷ (liters per gallon)
US gallon: 3.785411784 L/gal • Imperial gallon: 4.54609 L/gal
How to use this calculator
- Select the conversion direction you need.
- Choose whether your system references US or imperial gallons.
- Enter your measured flow value, then set decimals.
- Press Convert to show results above the form.
- Use CSV or PDF buttons to save outputs.
Recent calculation history
No history yet. Run a conversion to save it.