The design of pumping and drainage systems begins with a reliable calculation of wastewater flow. But this is often where the first hurdle lies: complicated tables, confusing standards, and a lack of tools make quick determination difficult.
We have developed a solution for this – an online tool for calculating wastewater flow that is simple, efficient, and permanently free to use.
Why is wastewater flow calculation important?
Wastewater flow is crucial for:
- the correct sizing of pumps and pipelines,
- the prevention of backflow or oversizing,
- compliance with technical regulations
Planners, installers, and engineering offices in particular benefit from a quick calculation.
How the tool works
With just a few clicks, you enter the type and number of connected drainage fixtures (e.g., toilets, showers, sinks). The tool automatically calculates the total wastewater volume (in l/s) – based on the standard values according to DIN.
Highlights of the tool:
- Easy to use directly in the browser
- No download, no registration
- Mobile-optimized for smartphone and tablet
- Option to add your own fixtures

Who is the tool designed for?
- Planning offices and HVAC engineers who need quick estimates for projects
- Installers who want to quickly recalculate on the construction site
- Site managers who want to verify quantities
- Training and education, to better illustrate standard values
Conclusion
Calculating wastewater flow doesn’t have to be complicated. With our tool, you get a reliable value in just a few seconds – whether at your desk or directly on site.