Pipe Sizing Calculator — Flow Rate and Pressure to Pipe Diameter
Enter flow rate (GPM) and pressure to calculate minimum pipe diameter for copper, PVC, or PEX.
Flow Parameters
How to Use the Pipe Sizing Calculator
Enter flow rate (GPM) and pressure to calculate minimum pipe diameter for copper, PVC, or PEX.
This free online pipe sizing calculator is designed for plumbers and field technicians who need fast, accurate results on the job or during the estimating process. No account required — enter your values and get results instantly.
When to Use This Tool
- 1.During new construction estimates and material takeoffs
- 2.When verifying calculations in the field before ordering materials
- 3.For proposal and quote preparation — give clients accurate numbers
- 4.As a cross-check against manual calculations or software output
- 5.For training new technicians on correct sizing procedures
Important Notes
Results from this pipe sizing calculator are estimates based on standard industry formulas and typical conditions. Always verify critical calculations with manufacturer specifications, local codes, and a licensed plumber before proceeding with installation or ordering materials. Actual requirements may vary based on local building codes, site conditions, and project-specific factors.
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