// multi-utility computation suite · offline · instant · precise
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eng.fluid-pipe-flow Calculator
Calculates pipe flow rate, head loss, and friction factor using the Darcy-Weisbach equation and Moody chart. Head loss in pipe flow increases with the square of velocity — doubling the flow rate quadruples the friction loss.
Inputs
Diameter Mm
Internal diameter of the pipe. Larger diameter reduces velocity and pressure drop but increases material cost.
Velocity Ms
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
Viscosity
Fluid resistance to flow. Water at 20°C: ~1 cP. Honey: 2,000–10,000 cP. Higher viscosity increases pumping power requirements.
Roughness Mm
Reference formula or conversion factor shown for context.
Whether the flow is laminar (smooth, ordered) or turbulent (chaotic). Determined by the Reynolds number: below 2,300 = laminar; above 4,000 = turbulent.
flow rate Q (L/s)
Flow rate Q — the volume of fluid passing a point per unit time.
pipe area (cm^2)
The computed two-dimensional surface area.
relative roughness e/D
The value at the specified point or condition.
friction factor (Moody est.)
A dimensionless multiplier applied in the calculation.