1/2 Inch Pipe Calculator & Complete Guide
Calculate flow rates, capacity, and sizing for 1/2 inch pipes. Complete guide to 1/2" pipe specifications, applications, and flow capacity for copper, PEX, PVC, and CPVC.
1/2 inch pipe is one of the most common sizes used in residential plumbing systems, typically serving as branch lines to individual fixtures. Understanding the flow capacity, applications, and proper sizing for 1/2" pipe is essential for plumbers and contractors. This comprehensive guide covers everything you need to know about 1/2 inch pipe, including flow rates for different materials, common applications, and code requirements.
Key Characteristics
Nominal Size
1/2"
Inside Diameter
0.485" - 0.622" (varies by material)
1/2" Pipe Flow Capacity by Material
Maximum recommended flow rates (GPM) for 1/2" pipe at standard velocity (6 ft/s). Actual capacity varies with pressure, temperature, and pipe length.
| Material | Inside Diameter | C-Value | Max Flow @ 6 ft/s (GPM) | Typical Use |
|---|---|---|---|---|
| Copper (Type L) | 0.545" | 140 | 4.2 | Water supply, standard |
| PEX | 0.485" | 150 | 3.3 | Flexible installation |
| CPVC | 0.485" | 150 | 3.3 | Hot/cold water |
| PVC | 0.485" | 150 | 3.3 | Cold water only |
Frequently Asked Questions
Code Compliance
1/2" pipe is approved for branch lines to fixtures per IPC and UPC codes. Minimum size for fixture supply lines is typically 1/2". Always verify local code requirements as some jurisdictions may have specific restrictions.