Water Flow in Tubes - Reynolds Number

Reynolds number for clean cold water flow. Determine if flow is laminar, transient, or turbulent based on dimensionless Reynolds Number calculations.

Calculator

Pipe Diameter (mm)

Flow Rate (L/min)

Water Temperature

Reynolds Number--

Flow Regime--

Pipe Size (inches)	Pipe Size (mm)	Reynolds @ 1 L/min	Reynolds @ 1 gal/min
1	25	835	3180
1 1/2	40	550	2090
2	50	420	1600
3	75	280	1060
4	100	210	780
6	150	140	570
8	200	105	400
10	250	85	320
12	300	70	265
18	450	46	175