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Faucet flow rate calculator

Turn a bucket test into a flow rate: enter the volume you collected and the time it took, and get gallons or litres per minute.

The measurement depends on how far the tap is open, on any other tap or appliance running at the same time, and on the time of day. Repeat it two or three times.

Enter your values, then calculate.

Method and limitations

Flow in litres per minute = volume collected in litres ÷ time in seconds × 60. US gallons are converted with 1 US gal = 3.785411784 L, and the flow in US gallons per minute is the flow in litres per minute ÷ 3.785411784. The flow is shown to one decimal place in L/min and two in US gal/min.

Sources

No external reference is documented for this calculation; its method and limitations are described above.

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