GPM Calculator (Gallons Per Minute)

The Gallons per minute calculator helps you calculate the volume, time, and flow rate.

Enter the volume and flow rate if you want to figure out the time.

Enter the time and flow rate to calculate the volume.

If you want to figure out the flow rate, enter the volume ( in US gallons) and time in seconds.

In case you don’t know, the rate of flow of water in gallons per minute is defined as GPM.

GPM = volume/time

This calculator is helpful in determining how much time will it take to fill the batch tub or a container.

Gallons per minute Calculator

You might be interested in finding the number of items you can fit in an electrical box or rebar quantity.


  • Trimmer, W. L. (1994). Estimating water flow rates.
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