Pipe Sizing Calculator
Look up minimum supply pipe diameter for a given fixture unit load per IPC Table E103.3.
Total supply fixture units for the pipe segment
Traditional choice; higher cost, long lifespan, approved everywhere
Minimum Pipe Diameter1.25in
Per IPC Table E103.3(1) -- applies to copper, PVC, and PEX supply pipe
IPC Table E103.3 Quick Reference
| Fixture Units | Min Pipe Size |
|---|---|
| 1 FU | 1/2 inch |
| 2-4 FU | 3/4 inch |
| 5-8 FU | 1 inch |
| 9-14 FU | 1-1/4 inch |
| 15-24 FU | 1-1/2 inch |
| 25-42 FU | 2 inch |
| 43-60 FU | 2-1/2 inch |
| 61-96 FU | 3 inch |
| 97-256 FU | 4 inch |
Reference: IPC Table E103.3(1) -- Demand versus required size of water-service and water-distribution pipe