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Water pipe flow rate table

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This water flow rate table shows water flow through pipes and copper tubing.

Volume of flow is at one foot per minute velocity in Pipe or Tube.

Schedule 40 pipe
Dia. inches	Cubic ft/min	Gallons/minute
1/8	0.0004	0.003
1/4	0.0007	0.005
3/8	0.0013	0.010
1/2	0.0021	0.016
3/4	0.0037	0.028
1	0.0062	0.046
1-1/4	0.0104	0.078
1-1/2	0.0141	0.106
2	0.0233	0.174

Schedule 80 pipe
Dia. inches	Cubic ft/min	Gallons/minute
1/8	0.0003	0.002
1/4	0.0005	0.004
3/8	0.0010	0.007
1/2	0.0016	0.012
3/4	0.0030	0.025
1	0.0050	0.037
1-1/4	0.0088	0.067
1-1/2	0.0123	0.092
2	0.0206	0.154

Type K Copper Tube
Dia. inches	Cubic ft/min	Gallons/minute
1/8	0.0002	0.0014
1/4	0.0005	0.0039
3/8	0.0009	0.0066
1/2	0.0015	0.0113
3/4	0.0030	0.0267
1	0.0054	0.0404
1-1/4	0.0085	0.0632
1-1/2	0.0196	0.1465
2	0.0209	0.1565

Type L Copper Tube
Dia. inches	Cubic ft/min	Gallons/minute
1/8	0.0002	0.002
1/4	0.0005	0.004
3/8	0.0010	0.008
1/2	0.0016	0.012
3/4	0.0034	0.025
1	0.0057	0.043
1-1/4	0.0087	0.065
1-1/2	0.0124	0.093
2	0.0209	0.161

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