HP to LPM Calculator
How to Convert HP to LPM
The HP to LPM Converter calculates the flow rate in liters per minute (LPM) from horsepower (HP), efficiency, and head using the following steps:
Step 1: Convert Head to Feet (if needed):
\( \text{Head (ft)} = \text{Head (cm)} \times 0.0328084 \)
\( \text{Head (ft)} = \text{Head (m)} \times 3.28084 \)
\( \text{Head (ft)} = \text{Head (in)} \times 0.0833333 \)
\( \text{Head (ft)} = \text{Head (ft)} \times 1 \)
Step 2: Calculate GPM (Gallons per Minute):
\( \text{GPM} = \frac{\text{HP} \times 3960 \times \text{Efficiency}}{\text{Head (ft)}} \)
Step 3: Convert GPM to LPM (Liters per Minute):
\( \text{LPM} = \text{GPM} \times 3.785411784 \)
Combined Formula:
\( \text{LPM} = \frac{\text{HP} \times 3960 \times \text{Efficiency} \times 3.785411784}{\text{Head (ft)}} \)
Where:
- \( \text{HP} \): Horsepower, a unit of power.
- \( \text{Efficiency} \): Pump efficiency as a decimal (e.g., 0.85 for 85%).
- \( \text{Head} \): Total dynamic head in selected unit (cm, m, in, or ft), converted to feet.
- \( \text{GPM} \): Gallons per minute, an intermediate flow rate unit.
- \( \text{LPM} \): Liters per minute, a metric unit of volumetric flow rate.
- \( 3.785411784 \): Conversion factor (1 US gallon = 3.785411784 liters).
Enter the horsepower, efficiency, head value, and select the head unit to calculate the flow rate in GPM and LPM.
Using the HP to LPM Converter
This converter is designed for applications in fluid dynamics, pump design, and hydraulic engineering to convert horsepower to flow rate in LPM.
Input the horsepower (HP), efficiency (as a decimal), head value, and select the head unit (cm, m, in, or ft). The calculator will convert the head to feet and display the flow rate in both GPM and LPM.
Example: Convert 2 HP to LPM with 0.85 efficiency and 5000 cm head.
- Horsepower: \( 2 \, \text{HP} \), Efficiency: \( 0.85 \), Head: \( 5000 \, \text{cm} \)
- Head in feet: \( 5000 \times 0.0328084 = 164.042 \, \text{ft} \)
- GPM: \( \frac{2 \times 3960 \times 0.85}{164.042} = 41.029373 \, \text{GPM} \)
- LPM: \( 41.029373 \times 3.785411784 = 155.270374 \, \text{LPM} \)
- Result: \( 2 \, \text{HP} = 155.27 \, \text{LPM} \)
Use this tool for accurate conversions in engineering and fluid flow calculations.
Common Conversion Table
The following table provides quick reference conversions for HP to LPM with Efficiency = 0.85 and Head = 50 ft (or equivalent in other units):
| HP |
Head |
GPM |
LPM |
| 1 |
50 ft |
67.32 |
254.77 |
| 2 |
1524 cm |
134.64 |
509.55 |
| 5 |
15.24 m |
336.60 |
1273.87 |
| 10 |
600 in |
673.20 |
2547.74 |
| 20 |
50 ft |
1346.40 |
5095.49 |
Use this table for quick lookups or to verify calculator results. Note: Head values are equivalent to 50 ft (1524 cm, 15.24 m, 600 in).
Common FAQ
Below are frequently asked questions about HP to LPM conversions:
- Q: What is the difference between GPM and LPM?
A: GPM (gallons per minute) measures flow rate in US gallons, while LPM (liters per minute) measures flow in liters. 1 GPM = 3.785411784 LPM.
- Q: Why is efficiency needed in the calculation?
A: Efficiency accounts for energy losses in pumps or systems, expressed as a decimal (e.g., 0.85 for 85% efficiency).
- Q: What units can I use for head?
A: You can input head in centimeters (cm), meters (m), inches (in), or feet (ft). The calculator converts all inputs to feet for computation.
- Q: How accurate is this converter?
A: The converter uses the precise factor 3.785411784 (1 US gallon to liters) and provides results rounded to 6 decimal places for GPM and 2 for LPM for accuracy.
- Q: Can negative values be used?
A: Negative HP or head values are not physically meaningful. Efficiency should be between 0 and 1. The calculator enforces positive head values.
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