Submersible Well Pump Sizing Calculator
Find the right pump size fast with our submersible well pump sizing calculator. Avoid low water pressure or pump damage by selecting the correct size. This guide helps you calculate accurate pump requirements step by step.
Well Pump Sizing Calculator
How to Use Submersible Well Pump Sizing Calculator
Follow these simple steps to use the submersible well pump sizing calculator:
- Enter Well Depth: Measure the total depth of your well in feet.
- Input Static Water Level: Add the distance from ground level to water level.
- Add Pumping Water Level: Include the expected water level when the pump runs.
- Enter Flow Rate Requirement: Specify gallons per minute (GPM) based on your household or irrigation needs.
- Add Total Pipe Length: Include horizontal and vertical pipe distance.
- Include Pressure Requirement: Standard home pressure ranges from 40–60 PSI.
- Click Calculate: The calculator will estimate required pump horsepower and head.
How to Calculate Submersible Well Pump Size - Calculation Guide
Learn how to calculate submersible well pump sizing manually:
Step 1: Calculate Total Dynamic Head (TDH)
TDH = Vertical Lift + Pressure Head + Friction Loss
Step 2: Convert Pressure to Head
1 PSI = 2.31 feet of head
Step 3: Add Friction Loss
Estimate based on pipe size and length (use charts or 5–10% rule)
Step 4: Determine Flow Rate (GPM)
Example: 3-bedroom home ≈ 8–12 GPM
Step 5: Select Pump Based on TDH and GPM
Match results with pump performance curve.
Real-Life Example:
- Well Depth = 150 ft
- Pumping Level = 100 ft
- Pressure Requirement = 50 PSI
- Pipe Length = 200 ft
Step 1: Vertical Lift = 100 ft
Step 2: Pressure Head = 50 × 2.31 = 115.5 ft
Step 3: Friction Loss ≈ 20 ft
Step 4: TDH = 100 + 115.5 + 20 = 235.5 ft
Step 5: Required Pump: Choose a pump delivering 10 GPM at ~236 ft head
Submersible Well Pump Sizing Conversion Chart
| Flow Rate (GPM) | Household Size | TDH Range (ft) | Pump HP Estimate |
|---|---|---|---|
| 5 – 8 | Small (1–2) | 100 – 200 | 0.5 HP |
| 8 – 12 | Medium (3–4) | 150 – 300 | 0.75 HP |
| 12 – 18 | Large (4–6) | 200 – 400 | 1 HP |
| 18 – 25 | Extra Large | 250 – 500 | 1.5 HP |
FAQs About Submersible Well Pump Sizing Calculator
A tool that calculates the correct pump size based on depth, pressure, and flow needs.
Proper sizing ensures consistent water pressure and prevents pump damage.
You will get low water pressure and poor performance.
It can cause short cycling and increase energy costs.
Most homes need 8–12 GPM depending on size and usage.
You can, but professional installation ensures safety and correct setup.
Add vertical lift, pressure head, and friction loss.
Most systems operate between 40–60 PSI.
Yes, smaller pipes increase friction loss and affect performance.
It provides reliable estimates, but final selection should match pump curves.