Tank Fill Time Calculator
Estimate fill duration for a known volume and steady average inflow.
How to use this calculator
- Enter volume remaining to fill and average inflow in the same volume units per minute.
- Check that every input uses the stated units and covers the same period, population or project scope.
- Change one assumption at a time when comparing scenarios.
Formula used by tank fill time calculator
Fill time = volume ÷ flow rate
- Fill time = volume ÷ flow rate
- It assumes steady inflow and does not model pressure changes, flow taper, tank geometry, simultaneous draw or interruptions.
- Inputs are validated against the tool-specific constraints; displayed results are rounded for readability.
Worked examples
Worked example
A 750-litre volume filled at 25 litres per minute takes about 30 minutes.
The calculator converts litres divided by litres per minute into minutes and hours.
The calculator converts litres divided by litres per minute into minutes and hours.
Understanding the result
Estimate fill duration for a known volume and steady average inflow.
It assumes steady inflow and does not model pressure changes, flow taper, tank geometry, simultaneous draw or interruptions.
Important notes
It assumes steady inflow and does not model pressure changes, flow taper, tank geometry, simultaneous draw or interruptions.
Treat the result as an estimate for the assumptions entered; verify important specifications against the relevant source or professional guidance.
Frequently asked questions
Can I use a pump’s maximum flow rating?
Measured average flow at the installed conditions is usually more representative than a theoretical maximum.
Does this include water already in the tank?
Enter only the remaining volume that must be filled.
How should I use this result?
Enter volume remaining to fill and average inflow in the same volume units per minute.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.