How it works
Fill time in hours = volume × 1000 / (inlet flow − outflow) / 60.
Input definitions
- Volume to fill (m³)
- Enter the value in the labeled unit.
- Inlet flow (litres/minute)
- Enter the value in the labeled unit.
- Simultaneous outflow (litres/minute)
- Enter the value in the labeled unit.
A worked example
- Volume to fill (m³)
- 30
- Inlet flow (litres/minute)
- 20
- Simultaneous outflow (litres/minute)
- 0
Assumptions & limits
Constant inlet and outflow. Volume is the remaining empty volume, not necessarily total tank capacity.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
What if water is leaving the tank while it fills?
Enter the simultaneous outflow. The tool divides the remaining volume by inlet minus outflow; if outflow equals or exceeds inflow, the tank cannot fill under this model.
Should I order exactly the quantity shown?
Treat the result as a planning estimate. Check measurements, units, pack sizes, waste, openings and local requirements; the stated formula does not replace a project-specific design.
How does the Pool and tank filling time tool work?
Fill time in hours = volume × 1000 / (inlet flow − outflow) / 60.
What are the assumptions and limits of Pool and tank filling time?
Constant inlet and outflow. Volume is the remaining empty volume, not necessarily total tank capacity.