Water Pipe Size Calculator
- Recommended pipe size
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- Approx flow capacity
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Rough sizing using IPC fixture-unit tables. Common WSFU: toilet 2.5, shower 2, sink 1, washer 4, dishwasher 1.4, water heater 3.
Fixture-unit quick reference
| Bathroom group (toilet+sink+shower) | 6 WSFU |
| Kitchen sink | 1.4 |
| Clothes washer | 4 |
| Dishwasher | 1.4 |
| Hose bibb (outdoor) | 2.5 |
| Water heater | 3 |
About this tool
Water Pipe Size 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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