Choose your calculation mode based on available information
Understand pump sizing principles, calculations, and industry applications
Choose the right mode for your situation:
Water Horsepower:
Brake Horsepower:
Required Motor HP:
Specific Speed:
Brake Horsepower (BHP) is calculated by dividing the Hydraulic (Water) Horsepower by the pump efficiency. Formula: BHP = (Q × H × SG) / (3960 × η), where Q is flow in GPM, H is head in feet, SG is specific gravity, and η is efficiency.
NPSHa (Available) is the absolute pressure at the pump suction minus vapor pressure, determined by the system design. NPSHr (Required) is the minimum pressure required by the pump to prevent cavitation, determined by the manufacturer. For safe operation, NPSHa must exceed NPSHr.
Total Dynamic Head (TDH) is the total equivalent height that a fluid is to be pumped, taking into account friction losses in the pipe. TDH = Static Head + Friction Head + Pressure Head.