Pipe Flow Velocity
Compute average water velocity using internal pipe diameter and volumetric flow rate.
v = Q / (πD²/4). Uses the entered internal diameter.
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Practical preliminary calculations for water systems. These are not automatic pipe-sizing or plumbing-code compliance tools.
Compute average water velocity using internal pipe diameter and volumetric flow rate.
v = Q / (πD²/4). Uses the entered internal diameter.
Calculate the gross volume of a rectangular water tank.
V = L × W × H. Excludes freeboard and unusable volume.
Estimate full-pipe discharge from known average velocity and internal diameter.
Q = A × v. Assumes full-pipe flow; not a drainage design model.
Engineering note: These calculators are for preliminary education and checks only. Verify allowable velocities, fixtures, pressure requirements, storage capacity, drainage conditions, and all applicable codes before using results for engineering design.
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