Pipe Sizing Calculator
Find the smallest pipe that carries your design flow without exceeding a target velocity. Enter the flow and material, set a max velocity, and get the recommended size with its actual velocity.
Target Flow
Recommended Size
Smallest listed size that keeps velocity at or below your target. Sizing for velocity only — also check available pressure and total friction loss for the full run.
Velocity-based sizing: the tool returns the smallest listed size where velocity ≤ your target (8 fps is a common supply ceiling). This is one of several checks — also confirm available pressure and total friction loss for the full run, and verify against the governing plumbing code.
Run your whole job on the same numbers
These NORDIX tools are a taste of the full platform — bid pipeline, estimating, and job costing that carry your numbers from the first bid to the final invoice.
See what NORDIX does →