Submersible Pump Size Calculator
Find the right pump quickly with a submersible pump size calculator. This guide helps you choose the correct pump size for your water needs. Save energy, avoid damage, and improve performance with accurate sizing.
Pump Power Requirement Calculator
How to Use Submersible Pump Size Calculator
Follow these simple steps to use a submersible pump size calculator:
- Enter Water Flow Requirement: Measure required flow rate in liters per minute (LPM) or gallons per minute (GPM).
- Input Total Head: Add vertical height (static head) and pipe friction losses.
- Select Pipe Length and Diameter: Longer pipes increase resistance. Enter accurate pipe details.
- Choose Power Supply: Select voltage and phase (single-phase or three-phase).
- Click Calculate: The calculator suggests the ideal pump size in HP or kW.
- Review Results: Check recommended pump capacity and efficiency range.
How to Calculate Submersible Pump Size
Follow this step-by-step method to manually estimate your pump size:
Step 1: Calculate Flow Rate (Q)
Example: You need 2000 liters in 20 minutes
Q = 2000 / 20 = 100 LPM
Step 2: Calculate Total Head (H)
Static head = 20 meters
Friction loss = 5 meters
Total Head (H) = 20 + 5 = 25 meters
Step 3: Use Pump Power Formula
Note: If Q is in LPM, convert to Liters Per Second (LPS) by dividing by 60 before using this formula constant (75).
Step 4: Apply Formula
Assume Efficiency = 60% (0.6)
Q (LPS) = 100 / 60 = 1.666 LPS
HP = (1.666 × 25) / (75 × 0.6)
HP = 41.66 / 45
HP ≈ 0.925 HP
Step 5: Select Nearest Pump Size
Choose a 1.5 HP submersible pump to ensure stable performance despite head variations or voltage drops.
Submersible Pump Size Conversion Chart
| Flow Rate (LPM) | Total Head (m) | Recommended Pump Size (HP) |
|---|---|---|
| 50 | 10–20 | 0.5 HP |
| 100 | 20–30 | 1.0–1.5 HP |
| 150 | 30–40 | 2.0 HP |
| 200 | 40–50 | 3.0 HP |
| 300 | 50–70 | 5.0 HP |
| 500 | 70–100 | 7.5–10 HP |
Note: Values are approximate. Adjust based on efficiency and pipe conditions.
FAQs – Submersible Pump Size Calculator
A tool that helps you determine the correct pump capacity (HP or kW) based on your required water flow rate and the total head lift of your system.
Correct sizing improves efficiency, reduces energy use, and prevents pump failure. An undersized pump won't provide enough water, while an oversized one wastes money and can damage the plumbing.
Total head is the sum of the vertical lift (static head) from the water level to the highest point of discharge, plus the friction losses caused by the pipe's length, diameter, and fittings.
Oversizing wastes energy and increases wear. It can also lead to "short cycling," where the pump turns on and off too frequently. Always choose the nearest correct size.
Use 50% to 70% efficiency if exact data is not available. Modern high-quality submersible pumps usually fall in the 60-65% range.
Yes. Smaller pipes increase friction loss and affect pump performance significantly. Choosing a larger pipe can allow for a smaller, more efficient pump.
It provides reliable estimates if you input correct data. For mission-critical or complex industrial applications, always have the results verified by a hydraulic engineer.
Yes. It works well for borewell and deep well applications as the physics of lifting water remains the same.
You can use Liters Per Minute (LPM) or Gallons Per Minute (GPM). Ensure consistency in units between flow and head (Metric vs Imperial).
For large systems or deep commercial wells, consult an engineer to confirm results and ensure the electrical system (cable size, breakers) can handle the load.