Pipe Flow Calculator
Calculate the volumetric flow rate of water based on pipe diameter and velocity.
How Plumbing Flow Works
The amount of water a pipe can carry depends entirely on two factors: the cross-sectional area of the pipe (diameter) and how fast the water is moving (velocity).
The Formula: Q = A × v (Flow Rate = Area × Velocity)
Pro Tip: In standard residential and commercial plumbing, engineers aim to keep water velocity between 2 and 5 feet per second. Speeds higher than 5 fps can cause pipe erosion, loud noises, and "water hammer" (a banging sound when valves close quickly).