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