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To use this calculator highlight the first box, then enter your new value. Press Tab, the flows will recalculate. Continue entering new values until all values are correct for this flow.
| psi before flowing | |
| Residual: | psi while flowing |
| Pitot: | pitot gage reading |
| Diameter: | size of hydrant opening (2 1/2"=2.5) or (4 1/2 = 4.5) |
| This hydrant is flowing: | GPM |
| At 20 psi this hydrant will flow about: | GPM |
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