United States • dedicated calculator
Well Pump Size Calculator
Estimate pump flow, total dynamic head and motor horsepower from household demand, well levels, pressure and pipe loss.
Specific inputs
live visual
transparent result
live visual
transparent result
1. EnterCalculator-specific values
2. ReviewUnits and assumptions
3. CalculateDedicated formula engine
4. VerifyResult, visual and guidance
Calculator inputs
Well Pump Size Calculator results
How the calculation works
TDH = lift + drawdown + pressure head + friction; horsepower = GPM × TDH ÷ 3960 ÷ efficiency.
What to verify
A well contractor should verify yield, casing, pump curve, wire, controls and pressure tank sizing.
How accurate is this calculator?
It is a transparent planning calculation based on the entered values and stated assumptions. Verify inputs and obtain professional or supplier confirmation where the decision is consequential.
Does it use U.S. defaults?
Yes. U.S. units, terminology, pricing conventions and rules are the primary defaults where location matters.
Is data sent to a server?
No. The calculation runs locally in the browser and does not send entered values to a remote calculation service.