Gallons Per Minute Calculator
Result
Gallons Per Minute Calculator Calculate flow rate in gallons per minute from volume and time, or from pipe diameter and velocity. — free online calculator.
Formula
- Gallons Per Minute Calculator calculates its result from Volume Gal, Time Min. It uses the formula GPM = volume (gal) ÷ time (min); or GPM = 0.4085 × D² × V (D in inches, V in ft/s). Change any input to recalculate the result instantly.
- The main inputs are Method, Volume, Time, Pipe Inside Diameter, Flow Velocity. Enter them in the units and format shown in the calculator.
- Keep measurements and project assumptions consistent before comparing or combining values.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Gallons Per Minute
- Method: volume
- Volume: 10
- Time: 2
- Pipe Inside Diameter: 2
- Flow Velocity: 5
Using Volume Gal = 2, Time Min = 3, the calculated result is 0.6666666667.
Sample result: Calculating…
Frequently asked questions
What does the Gallons Per Minute calculate?
Gallons Per Minute Calculator Calculate flow rate in gallons per minute from volume and time, or from pipe diameter and velocity. — free online calculator.
Which values should I enter?
Enter Method, Volume, Time, Pipe Inside Diameter, Flow Velocity using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: GPM = volume (gal) ÷ time (min); or GPM = 0.4085 × D² × V (D in inches, V in ft/s).
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.