GPM to LPS Calculator
Convert flow rate in gallons per minute (GPM) to liters per second (LPS) with this professional flow rate calculator. Ideal for pump sizing, water treatment systems, and irrigation modeling, it delivers fast, expert-verified results instantly.
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GPM to LPS Calculator
Calculations are standard physical flow conversions. Real-world plumbing must account for dynamic pipe friction, pipe diameters, and fluid specific gravity.
💡 Flow Note:
1 US gallon per minute equals 0.0630902 liters per second. This conversion is crucial in civil engineering, pump sizing, storm water runoff analysis, and water distribution networks to reconcile US customary flow rates with metric system standards.
How to Use GPM to LPS Calculator
Converting volumetric flow rate from gallons per minute to liters per second is simple with this tool. If you need other conversions, you can check our GPM to CFS Calculator or GPM to MGD Calculator. Sizing fluid mechanics systems, choosing booster pumps, and verifying flow dynamics require accurate conversions. Follow this professional workflow to obtain verified flow results:
- Step 1: Enter the flow rate value in gallons per minute (GPM) in the numeric input box.
- Step 2: Choose your desired decimal precision from the dropdown menu.
- Step 3: Click the Calculate button to process the flow conversion.
- Step 4: View the equivalent flow rate in liters per second (L/s) displayed in the main output card.
- Step 5: Review secondary outputs such as liters per minute, cubic meters per hour, and gallons per hour in the details container.
How to Calculate GPM to LPS
Converting water flow rate values between US gallons per minute (GPM) and liters per second (LPS) requires utilizing the exact physical relationship between gallons, liters, and time. This is useful when comparing values against our GPM to PSI Calculator or when calculating large-scale discharges with the GPM to MGD Calculator. You can also use our general Flow Rate Calculator to evaluate pipeline velocity. Follow this standard conversion formula:
Where:
- LPS = Volumetric flow rate in liters per second
- GPM = Volumetric flow rate in gallons per minute
- 0.0630902 = The standard multiplier coefficient to convert gallons per minute to liters per second
Step-by-Step Practical Example
Convert a water pump discharge flow rate of 100 GPM into liters per second:
Given:
Flow Rate = 100 GPM
Calculation:
Result:
100 GPM = 6.309 L/s
Where is GPM to LPS Conversion Used?
This flow rate conversion is a standard calculation in major environmental and piping designs:
- Irrigation systems: Sizing sprinkler networks and main irrigation channels.
- Water distribution: Sizing municipal lines, water towers, and intake facilities.
- Pump performance calculations: Matching pumps rated in GPM to environmental flow charts defined in LPS.
- Hydraulic studies: Sizing wastewater treatment systems, open channels, and piping systems.
GPM to LPS Chart
This reference chart displays conversions from gallons per minute (GPM) to liters per second (LPS). All values are calculated using the standard flow rate conversion factor and are rounded to four decimal places for precise engineering references.
| Flow Rate (GPM) | Flow Rate (L/s) |
|---|---|
| 1 GPM | 0.0631 L/s |
| 5 GPM | 0.3155 L/s |
| 10 GPM | 0.6309 L/s |
| 20 GPM | 1.2618 L/s |
| 50 GPM | 3.1545 L/s |
| 100 GPM | 6.3090 L/s |
| 200 GPM | 12.6180 L/s |
| 500 GPM | 31.5451 L/s |
| 1000 GPM | 63.0902 L/s |
Note: All calculations in the table are rounded to four decimal places. Use the calculator above to model custom operating parameters.
GPM to LPS Frequently Asked Questions
To convert US Gallons per Minute (GPM) to Liters per Second (L/s or LPS), you multiply the flow rate by the standard conversion factor of 0.0630902. This factor is derived by dividing 3.785411784 (liters per gallon) by 60 (seconds per minute).
A flow rate of 100 GPM is equal to approximately 6.309 liters per second (LPS). This is calculated by multiplying 100 by the GPM-to-LPS conversion factor of 0.0630902, which yields 6.30902 L/s.
The formula to convert gallons per minute to liters per second is: LPS = GPM × 0.0630902. This equation is widely utilized in pump manufacturing and international water utility planning to translate US units into metric system standards.
Converting GPM to LPS allows engineers to standardize and communicate flow rates across different regions. While GPM is standard in the United States, LPS is the preferred metric unit in Europe and international scientific contexts for pumps, wastewater, and piping design.
GPM can refer to both US gallons per minute and Imperial gallons per minute. US GPM is standard in the USA, where 1 US gallon equals approximately 3.785 liters. Imperial GPM is standard in the UK, where 1 Imperial gallon equals approximately 4.546 liters. This calculator uses US GPM by default.
There are exactly 0.0630901964 liters per second in one US gallon per minute. In engineering calculations, this coefficient is rounded to 0.0630902 or simply 0.0631 for fast approximations.