Tank Fill Time
Find how long a tank takes to fill at a given flow rate.
About Tank Fill Time
The time to fill a tank is simply its volume divided by the inflow rate. Running the numbers in minutes, hours and seconds makes planning practical. Whether refilling a pool, a cistern or an aquarium, the fill time governs scheduling and whether the supply can keep up.
Formula
Tank Fill Time
Fill time = volume / flow rate
- flow rate
- Gallons delivered per minute
Worked example
With the default values below, Tank Fill Time returns Fill Time of 62.5. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Tank volumeminimum 0 gallons
- 500 gallons
- Flow rateminimum 0.001 gpm
- 8 gpm
Results
- Fill Time
- 62.5 min
- Fill Time in Hours
- 1.04 hr
- Fill Time in Seconds
- 3,750 sec
Step by step
- 1Values used
- 2Tank Fill Time
- 3Fill Time= 62.5 min
- 4Fill Time in Hours= 1.04 hr
- 5Fill Time in Seconds= 3,750 sec
Assumptions and limits
- The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Tank Fill Time calculated?
Fill time = volume / flow rate The time to fill a tank is simply its volume divided by the inflow rate. Running the numbers in minutes, hours and seconds makes planning practical.
Why does Tank Fill Time matter?
Whether refilling a pool, a cistern or an aquarium, the fill time governs scheduling and whether the supply can keep up.
What values do I need to enter?
This calculator takes 2 inputs: Tank volume, Flow rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.