Tank Fill and Drain Time Calculator
Estimate time to reach a higher liquid volume with simultaneous constant inflow and outflow.
Your result
EVERYDAYEnter your values and select calculate.
On this page How it works & practical examples
How to use the Tank Fill and Drain Time Calculator
Use constant simultaneous flow rates and a target no lower than the current volume. If the target already equals the current volume, elapsed time is zero.
The calculation
Worked example
Raising a tank from 100 L to 1,000 L with 30 L/min inflow and 10 L/min outflow takes 45 minutes.
Assumptions and limits
Does not assess tank capacity or overflow protection. Variable pressure, changing outflow head, leaks and interrupted pumps can change the actual time.
Common questions
Which inputs should I use?
Use constant simultaneous flow rates and a target no lower than the current volume. If the target already equals the current volume, elapsed time is zero.
What does the result exclude?
Does not assess tank capacity or overflow protection. Variable pressure, changing outflow head, leaks and interrupted pumps can change the actual time.