Pool Fill Time Calculator
Fill time = required volume ÷ flow rate
Estimate fill time from required volume and a measured constant flow rate.
Formula
Fill time = required volume ÷ flow rate
Worked example
Required water volume: 20000 L
Fill rate: 20 L/min
With these inputs, the result is 16.6666667 hours.
How to use this calculator
- Identify the quantity you want to calculate.
- Enter your measurements in the units shown on each field.
- Read the result, which updates as you change the inputs.
- Check the assumptions below before applying the result.
Assumptions and limits
Actual supply flow may vary. This does not estimate overflow or unattended filling risk.
Precision and checking
Results are rounded for display. Use the most accurate measurements available, and avoid rounding your inputs unnecessarily. Extra decimal places in a result do not make an estimate more reliable.
To check a result, substitute the same input values into the formula shown above. Change one value at a time to understand how the quantity responds.
Frequently asked questions
What assumptions does this calculation use?
Actual supply flow may vary. This does not estimate overflow or unattended filling risk.
Are my inputs sent to a server?
No. The calculation runs locally in your browser. The result updates as you edit the inputs.
