LPM to GPM Calculator
Convert Liters per Minute (LPM) to US Gallons per Minute (GPM) instantly. Sizing fluid mechanics systems, choosing booster pumps, and verifying flow dynamics require accurate and verified volumetric calculations.
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LPM to GPM Calculator
Calculations are standard physical conversions. Real-world pump configurations must account for pipe friction, temperature, and fluid specific gravity.
💡 This calculator uses US liquid gallons for conversion: 1 LPM = 0.264172 GPM.
How to Use LPM to GPM Calculator
Converting volumetric flow rate values from liters per minute (LPM) to US gallons per minute (GPM) is simple and straightforward. Accurately sizing hydraulic piping, industrial pumps, and water distribution systems requires precise conversion calculations. Follow this step-by-step procedure to convert your flow rates:
- Step 1: Enter the flow rate in liters per minute. Input the volumetric flow value in LPM in the dedicated input box.
- Step 2: Click Calculate Flow. Click the Calculate Flow button to run the conversion.
- Step 3: View the equivalent flow rate in US GPM. The converted value in gallons per minute will instantly display in the primary output card.
- Step 4: Analyze alternative units in the detail cards. Review the secondary output cards displaying the equivalent flow in liters per second (L/s) and cubic meters per hour (m³/hr).
How to Calculate LPM to GPM
To manually convert volumetric flow rate from liters per minute (LPM) to US gallons per minute (GPM), use the standard physical conversion factor. Since one US gallon equals exactly 3.785411784 liters, one liter is equal to approximately 0.264172 US gallons. Consequently, the relationship between these flow units is defined by the following conversion formula:
Where:
- LPM: Liters per minute, which is the standard metric unit for measuring volumetric flow.
- GPM: Gallons per minute, which is the customary unit of flow measurement in the United States.
Step-by-Step Calculation Example
Let's convert a pump output of 50 LPM to GPM to evaluate its performance against US equipment standards:
Step 1: Identify the flow rate in LPM. In this example, the given flow rate is 50 LPM.
Step 2: Apply the conversion multiplier. Multiply the flow rate by the conversion factor of 0.264172:
Step 3: Solve the equation. Calculate the mathematical product:
Final Answer:
50 LPM = 13.21 GPM (rounded to two decimal places for standard engineering precision).
LPM to GPM Chart
This reference chart displays conversions from liters per minute (LPM) to US gallons per minute (GPM). All values are calculated using the standard US liquid gallon conversion factor of 0.264172 and are rounded to two decimal places for practical field reference.
| Flow Rate (LPM) | Gallons per Minute (GPM) |
|---|---|
| 1 LPM | 0.26 GPM |
| 5 LPM | 1.32 GPM |
| 10 LPM | 2.64 GPM |
| 20 LPM | 5.28 GPM |
| 30 LPM | 7.93 GPM |
| 40 LPM | 10.57 GPM |
| 50 LPM | 13.21 GPM |
| 60 LPM | 15.85 GPM |
| 75 LPM | 19.81 GPM |
| 100 LPM | 26.42 GPM |
| 150 LPM | 39.63 GPM |
| 200 LPM | 52.83 GPM |
| 250 LPM | 66.04 GPM |
| 300 LPM | 79.25 GPM |
| 500 LPM | 132.09 GPM |
| 1000 LPM | 264.17 GPM |
Note: All calculations are based on US liquid gallons where 1 US Gallon = 3.785411784 Liters.
LPM to GPM Frequently Asked Questions
To convert liters per minute (LPM) to US gallons per minute (GPM), you multiply the flow rate in LPM by 0.264172. Alternatively, you can divide the flow rate by 3.78541. This factor is derived from the standard definition of a US liquid gallon, which equals exactly 3.785411784 liters.
1 LPM is equal to exactly 0.264172 GPM (US Gallons per Minute). In engineering practice, this value is often rounded to 0.26 GPM for quick estimates in flow rate calculations.
Yes, this calculator operates on US liquid gallons, which are defined as 231 cubic inches or exactly 3.785411784 liters. If you require Imperial GPM (used in the UK and some Commonwealth nations), where 1 Imperial gallon equals 4.54609 liters, you must multiply LPM by 0.219969 instead.
100 LPM is equal to approximately 26.42 GPM. This is calculated using the formula: GPM = 100 × 0.264172, which yields 26.4172 GPM. This flow conversion is commonly found in industrial dosing systems and small centrifugal pump applications.
Yes, this calculator is designed for pump users, piping designers, and mechanical engineers. Volumetric flow rate conversions between LPM and GPM are standard operations when comparing domestic pump flow curves with metric equipment data sheets.
LPM (liters per minute) is a metric unit of volumetric flow rate used globally under the SI-derived system. GPM (gallons per minute) is a US customary unit used mainly in North America. LPM represents a smaller volume than GPM, meaning 1 GPM yields a higher velocity and flow volume than 1 LPM.