Pipe Pressure Drop Calculator Pipe Pressure Drop Calculator Calculate pressure loss in fluid systems Flow Rate Liters/sec (L/s) m³/hour Gallons/min (GPM) Pipe Diameter Millimeters (mm) Inches Pipe Length Meters Feet Fluid Viscosity Centipoise (cP) Pa·s Fluid Density (kg/m³) Pipe Roughness (mm) Pressure Drop 0 Reynolds Number 0 Flow Regime - Calculate Download PDF