About this calculator
Run a tap or hose into a bucket, time it, and get the flow rate. Then see how long a pool, tank or system will take to fill.
How it’s calculated
Flow = volume ÷ time.
Worked example
With these inputs:
- Container volume
- 5 gal
- Seconds to fill
- 40
- Volume to fill (optional)
- 500 gal
the result is:
- Flow rate
- 7.5 gpm
- Litres per minute
- 28.4
- Per hour
- 450 gal
- Time to fill target
- 1.1 hours
Tips from the trade
- Use the largest container you can, and time two or three fills.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and local building codes before ordering.