Sanitary Drainage Calculator
Static · formula-only · worked example computed when this page was built · no live data
The Sanitary Drainage Calculator sizes the sanitary stack from the total drainage fixture units and design flow. Example: for a 3-floor building sanitary stack serving 10 water closets, Total DFU = 40 DFU, Stack size = 100 mm, Design flow = 5.42 L/s (per NSCP Vol.2 | PSME Code | ASPE Vol.2 | IPC (as adopted by NSCP)).
How it works
Computed from your inputs per NSCP Vol.2 | PSME Code | ASPE Vol.2 | IPC (as adopted by NSCP). Anything the worked example does not state uses this calculator's standard default; the interactive version shows every input and lets you change it.
Worked example (Plumbing & Pumps)
Inputs: a 3-floor building sanitary stack serving 10 water closets.
| Result | Value |
|---|---|
| Total DFU | 40 DFU |
| Stack size | 100 mm |
| Design flow | 5.42 L/s |
Computed by WorkHive's calculation engine when this page was built; standard: NSCP Vol.2 | PSME Code | ASPE Vol.2 | IPC (as adopted by NSCP).
How to use this calculator
- Read the worked example. It uses a 3-floor building sanitary stack serving 10 water closets and shows every number in the method.
- Follow the formula with your own figures: it returns Total DFU, Stack size, Design flow, computed per NSCP | Philippine Plumbing Code.
- To compute interactively, open the Sanitary Drainage Calculator inside WorkHive's free Engineering Design suite (link below). It runs the same method with your inputs.
FAQ
What is a sanitary sewer sizing calculator DFU?
The Sanitary Drainage Calculator is a free online tool that sizes the sanitary stack from the total drainage fixture units and design flow. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following NSCP | Philippine Plumbing Code. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive is free: this worked example is open to everyone, and the interactive calculator runs inside the free Engineering Design suite after a free sign-up (your work is saved to your account). WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Sanitary Drainage Calculator in WorkHive. Free, and a free sign-up saves your calculations, BOMs and scope-of-works to your account.