Estimate pump size from flow rate, total dynamic head, vertical lift, discharge pressure, pipe friction, pump efficiency, and required horsepower. Use this calculator for water pumps, booster pumps, transfer pumps, irrigation pumps, well pumps, and general plumbing pump sizing.
Pump horsepower:
The calculator estimates required pump horsepower from flow rate, total dynamic head, and pump efficiency.
Total dynamic head:
The calculator adds vertical lift, pressure head, suction lift, and friction head.
Flow capacity:
The calculator estimates the flow a selected horsepower can support at the calculated head.
Capacity check:
The calculator compares a known pump capacity against the required flow rate.
A pump size calculator helps estimate the flow, head, and horsepower needed before choosing a pump.
It can help compare GPM, total dynamic head, vertical lift, pressure head, friction loss, pump horsepower, efficiency, and capacity margin.
Your result shows an estimated pump horsepower, total dynamic head, and capacity margin. Use this as a planning estimate only. Final pump selection should be checked against a manufacturer pump curve, actual piping layout, suction conditions, pipe material, fittings, valves, system pressure, and required duty point.
Estimate the required flow rate and total dynamic head, then choose a pump that can deliver that flow at that head according to the manufacturer pump curve.
Total dynamic head is the total resistance the pump must overcome, including vertical lift, outlet pressure, suction lift, and friction loss from pipe and fittings.
No. Horsepower alone is not enough. You need to check the pump curve to confirm the pump can deliver the needed flow at your required head.
No. This calculator gives a planning estimate. Final pump sizing should use the actual system layout and manufacturer pump performance data.