Irrigation Pipe Sizing Calculator
Pipe sizing by flow (GPM): ½"→4, ¾"→9, 1"→18, 1¼"→30 (max ≈5 ft/sec).
About this tool
Irrigation Pipe Sizing Calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
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