Well Pump Size Calculator
Estimate required peak flow and total dynamic head for a well pump from your demand, depth and piping. An estimate to discuss with a professional.
1 · Estimate peak demand
Per-fixture flows: bathroom group 4, kitchen 2.5, laundry 2, outdoor 5 gpm (assumptions — adjust below).
Share of fixtures assumed running at once (0.1–1).
2 · Head & piping
ft
Depth to water while pumping.
ft
psi
ft
in
Estimated requirements
Estimated peak flow
8.8 gpm
Friction loss
10.3 ft
Hazen-Williams, +25% fittings
Pressure head
115.5 ft
50 psi × 2.31
Total dynamic head
265.8 ft
| Head component | Feet |
|---|---|
| Pumping water level (lift) | 120 |
| Elevation to outlet | 20 |
| Pressure head | 115.5 |
| Friction losses | 10.3 |
| Total dynamic head | 265.8 ft |
Do not select a pump from this alone
This gives a target flow and total dynamic head. Choosing an actual pump requires matching these to the manufacturer’s pump curve and to your well’s tested yield and drawdown. Have a licensed well professional confirm before purchasing or installing.
This is an estimate, not a specification
Results are for orientation only and depend on the accuracy of your inputs and assumptions. They do not replace a professional assessment, a manufacturer’s performance data, or laboratory testing. See our disclaimer.