Pipe Flow Calculator

Your details

Inner (bore) diameter of the pipe. 50 mm = 2-inch nominal pipe.
mm
Total straight-run length of the pipe section.
m
Affects the absolute roughness used in the Colebrook-White equation.
Choose which known quantity to start from.
Mean fluid velocity in the pipe. Typical water range: 0.5-3 m/s.
m/s
Pre-fills density and dynamic viscosity for the chosen fluid.
Volumetric flow rateTurbulent flow
0.003927m³/s

Volume of fluid passing a cross-section per second

Flow rate (L/s)3.927L/s
Flow rate (L/min)235.62L/min
Mean velocity2m/s
Reynolds number99,621
Darcy friction factor0.02191
Pressure drop87,481.8Pa
Head loss8.937m
Flow regimeTurbulent
99,621
Laminar<2300Transitional2300-4000Turbulent4000+

Turbulent flow - Re = 99,621, Q = 235.6 L/min

  • Flow rate is 235.6 L/min (3.927 L/s) at a mean velocity of 2.00 m/s.
  • Turbulent flow: fluid mixes vigorously across the cross-section. Pipe roughness dominates pressure drop at very high Reynolds numbers.
  • Darcy friction factor is 0.02191. A lower-roughness material such as plastic or copper would reduce this and cut pressure losses.
  • Pressure drop over the specified length is 87.48 kPa (12.69 psi).

Next stepThe velocity is within the commonly recommended range (0.5-3 m/s for water). Add minor losses (bends, valves, fittings) to get the full system pressure drop.

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