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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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