Water Flow Rate (gpm) | gpm | ||

Pipe diameter (inches) | inches | ||

V = | ft/sec | ||

## Calculate |
## Reset |

Water Flow Rate (gpm) | gpm | ||

Water Velocity (ft/sec) | ft/sec | ||

D = | inches | ||

## Calculate |
## Reset |

Pipe Diameter (inches) | inches | |

Water Velocity (ft/sec) | ft/sec | |

Q = | gpm | |

## Calculate |
## Reset |

- Fill out the green spaces only.
- This is a basic tool for quick reference purposes only, it is not intended to be used for hydronic systems design.
- ASHRAE 90.1 recommends water velocities between 4.4 and 12.4 ft/sec depending on operating hours per year and application. For more details, see table above.