Reynolds Number & Pipe Flow Regime Calculator
Determine laminar, transitional, or turbulent flow regimes in pipes, Darcy friction factor (Swamee-Jain), and frictional pressure loss per meter.
Fluid & Conduit Properties
kg/m³
mPa·s
mm
m/s
Reynolds Number (Re)
FULLY TURBULENT FLOW
74,716
Inertial forces dominate viscous forces (Re > 4,000)
Darcy Friction Factor (f)
0.0227
Relative Roughness: ε/D = 0.0009
Pressure Gradient (ΔP/L)
509.6 Pa / m
0.510 kPa/m (5.20 m H2O / 100m)
Volumetric & Mass Flow Rates
Volumetric Flow Rate (Q):
176.7 L/min (10.6 m³/h)
Mass Flow Rate (ṁ):
2.94 kg/s (176.4 kg/min)
Kinematic Viscosity (ν):
1.004 × 10⁻⁶ m²/s (1.004 cSt)