HP to LPS Calculator
How to Convert HP to LPS
The HP to LPS Converter calculates the flow rate in liters per second (LPS) 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 LPS (Liters per Second):
\( \text{LPS} = \text{GPM} \times 0.063090196 \)
Combined Formula:
\( \text{LPS} = \frac{\text{HP} \times 3960 \times \text{Efficiency} \times 0.063090196}{\text{Head (ft)}} \)
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.
- \( \text{LPS} \): Liters per second, a metric unit of volumetric flow rate.
- \( 0.063090196 \): Conversion factor (1 US gallon = 3.785411784 liters, divided by 60 seconds).
Enter the horsepower, efficiency, head value, and select the head unit to calculate the flow rate in GPM and LPS.
Using the HP to LPS Converter
This converter is designed for applications in fluid dynamics, pump design, and hydraulic engineering to convert horsepower to flow rate in LPS.
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 LPS.
Example: Convert 2 HP to LPS 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: \( \frac{2 \times 3960 \times 0.85}{164.042} = 41.029373 \, \text{GPM} \)
- LPS: \( 41.029373 \times 0.063090196 = 2.587839 \, \text{LPS} \)
- Result: \( 2 \, \text{HP} = 2.59 \, \text{LPS} \)
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 LPS with Efficiency = 0.85 and Head = 50 ft (or equivalent in other units):
| HP |
Head |
GPM |
LPS |
| 1 |
50 ft |
67.32 |
4.25 |
| 2 |
1524 cm |
134.64 |
8.49 |
| 5 |
15.24 m |
336.60 |
21.23 |
| 10 |
600 in |
673.20 |
42.46 |
| 20 |
50 ft |
1346.40 |
84.92 |
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 LPS conversions:
- Q: What is the difference between GPM and LPS?
A: GPM (gallons per minute) measures flow rate in US gallons, while LPS (liters per second) measures flow in liters. 1 GPM = 0.063090196 LPS (1 US gallon = 3.785411784 liters ÷ 60 seconds).
- 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 0.063090196 (1 US gallon = 3.785411784 liters ÷ 60) and provides results rounded to 6 decimal places for GPM and 2 for LPS 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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