Drainage Pipe Calculator
Size drainage pipes based on fixture units (DFU) and gradient requirements. Calculate branch, stack, and vent pipe diameters for residential and commercial plumbing systems.
Sanitary Fixtures
DFU = Drainage Fixture Units (measure of probable discharge)
Building & Pipe Details
Simultaneity factor: 0.5 (reduces peak load)
Calculate vertical stack for multi-floor buildings
Add fixtures and click Calculate to size drainage pipes
Notes:
- Calculations based on BS EN 12056-2 for gravity drainage
- DFU (Drainage Fixture Units) represent probable discharge
- Simultaneity factors account for non-simultaneous usage
- Stack sizing considers total load from all floors
- Consult local codes for specific requirements
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DISCLAIMER
This calculator provides ESTIMATES for preliminary planning purposes. Results are based on standard assumptions and may not reflect your specific project conditions.
By using this tool, you acknowledge that:
1. All calculations are approximate and based on typical industry standards and assumptions.