Pipe Diameter Calculator

Change any input to update the calculation. Unit changes preserve the physical quantity.

CALCULATION SETUP

Inputs

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Pipe Reynolds Number Reference ↗Inspect the fluid/viscosity scenario; regime thresholds are conditional.

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CALCULATED VALUE

Results

Calculated inside diameter

41.203 mm1.622 in

Volumetric flow

2 L/s120 L/min7.2 m³/h0.002 m³/s31.701 GPM (US)4.238 CFM

Mean velocity

1.5 m/s4.921 ft/s
Q 2 L/sv 1.5 m/sInside diameter 41.203 mm
Full circular pipe bore with flow and mean velocity · schematic, not to scale

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Assumptions & checks

Calculated diameter is inside bore, not nominal size. Continuity does not check pressure loss, roughness, fluid properties, partial filling, compressibility or pipe-code compliance.