Our Gallons per Minute Calculator (GPM) works with a variety of measures and can convert LPM (Litres per Minute) to GPM, GPM to LPM, gallons per hour to gallons per minute, and more. Learn more about the GPM meaning, GPM unit, and GPM formula by reading the accompanying material. You’ll learn how to calculate GPM in no time.

On the other hand, make sure to see our other related calculators, such as:

Gallons per Minute (GPM) – Definition

Gallons per minute, or GPM, is a measurement of how many gallons a pump can move each minute. Flow rate is another name for it. The Head is a measurement that relates to the height that the water must reach in order to be pushed through the units system. GPM is very dependent on this measurement. Flow rate is another name for it.

Showerhead GPM flow rates are regulated by the federal, state, and municipal governments because the potential for water and energy savings is enormous. According to one study, bathing is one of the most common ways we use water in the house, accounting for about 17 percent of residential indoor water consumption – or nearly 40 gallons per day for the average family. The United States uses about 1.2 trillion gallons of water per year just for showering.

When it comes to a head measurement, there are a variety of dimensions to consider, including:

  • Total head: The fluid’s discharge point.
  • The distance between the fluid source and the pump is known as the total suction head.
  • The distance between the pump and the highest point to which the fluid will be pushed is known as the total discharge head.

How to Calculate Gallons Per Minute?

We can calculate the GPM by dividing 60 by the time it takes to fill a one-gallon container. So, if you fill a gallon container in 10 seconds, your GPM measurement is 6 GPM (60/10 seconds = 6 GPM). The pressure tank technique and formula are the most precise for calculating GPM.

You’ll need to know your pressure tank’s characteristics for this calculation, such as the number of gallons it contains, the gallon drawdown, and the PSI. The manufacturer specifies the gallon drawdown. Follow these procedures after you have the information and a stopwatch to keep track of time:

  • Remove the pressure tank and empty it;
  • When you hear the pressure switch turn on, start your stopwatch;
  • When the switch is turned off, stop the stopwatch;
  • Divide the length of time on your stopwatch by the amount of drawdown.

Your GPM rate would be five if the pressure switch took four minutes to turn off and you had a 20-gallon depletion. What is important is that if you don’t have access to a pressure tank, you need to fill maybe a bucket or any other container with water, time how long it takes to fill it, then divides the time by the capacity of the container.

Gallons per Minute Formula

GPM indicates a pump’s distinct capabilities, so you can choose the best one for your needs. For example, if you require a pump for a bigger public area like a golf course, marina, or lake, you’ll need one with a considerably greater GPM than you’ll need for your home’s well.

Furthermore, selecting the right pump is critical for lowering expenses and extending the life of your pump. In essence, you only need to enter any two variables you are familiar with, and the GPM calculator will calculate the third. Finally, we utilize the GPM calculation to figure out how many GPM are flowing:

GPM = \frac {Volume} {Time} 

GPM to LPM and Other Units

Liters per minute (l/min) is abbreviated as LPM. It is a measurement of the velocity at which air flows into the sample probe when employed in the context of a particle counter’s flow rate. For example, assume you wish to convert the volume of 15 GPM to LPM (gallons per minute to liters per minute).

First, you need to check out the flow rate unit is set to gallons per minute before entering the number. Then, change the unit to liters per minute after that. Then, the number in the Flow rate field will be converted using the GPM calculator.

Table GPM to LPM

1 gal/m = 3.7854 lt/m11 gal/m = 41.6395 lt/m21 gal/m = 79.4936 lt/m
2 gal/m = 7.5708 lt/m12 gal/m = 45.4249 lt/m22 gal/m = 83.2791 lt/m
3 gal/m = 11.3562 lt/m13 gal/m = 49.2104 lt/m23 gal/m = 87.0645 lt/m
4 gal/m = 15.1416 lt/m14 gal/m = 52.9958 lt/m24 gal/m = 90.8499 lt/m
5 gal/m = 18.9271 lt/m15 gal/m = 56.7812 lt/m25 gal/m = 94.6353 lt/m
6 gal/m = 22.7125 lt/m16 gal/m = 60.5666 lt/m26 gal/m = 98.4207 lt/m
7 gal/m = 26.4979 lt/m17 gal/m = 64.352 lt/m27 gal/m = 102.206 lt/m
8 gal/m = 30.2833 lt/m18 gal/m = 68.1374 lt/m28 gal/m = 105.992 lt/m
9 gal/m = 34.0687 lt/m19 gal/m = 71.9228 lt/m29 gal/m = 109.777 lt/m
10 gal/m = 37.8541 lt/m20 gal/m = 75.7082 lt/m30 gal/m = 113.562 lt/m
40 gal/m = 151.416 lt/m70 gal/m = 264.979 lt/m100 gal/m = 378.541 lt/m
50 gal/m = 189.271 lt/m80 gal/m = 302.833 lt/m110 gal/m = 416.395 lt/m
60 gal/m = 227.125 lt/m90 gal/m = 340.687 lt/m120 gal/m = 454.249 lt/m
200 gal/m = 757.082 lt/m500 gal/m = 1892.71 lt/m800 gal/m = 3028.33 lt/m
300 gal/m = 1135.62 lt/m600 gal/m = 2271.25 lt/m900 gal/m = 3406.87 lt/m
400 gal/m = 1514.16 lt/m700 gal/m = 2649.79 lt/m1000 gal/m = 3785.41 lt/m
  Table with units gal/m to lt/m

Gallons per Minute Calculator (GPM) – Example

Let’s take an example. It takes 5 seconds for the one gallon container to fill. Therefore, the volume of 60 gallons per minute divided by 5 is 12 gallons per minute. To calculate GPM with a bigger container, multiply the capacity in gallons by the number of seconds required to fill the container, then multiply by 60.

GPM = \frac {Container  size  in  gallons} {Seconds  to  fill  container  } \times 60

Using a volume of 5 gallon container as an example, filling the container takes 14 seconds. As a result, 5 divided by 14 and multiplied by 60 yields a 21.4 GPM.


What is GPM?

Gallons Per Minute (GPM) is an abbreviation for gallons per minute. GPM is a measurement of how many gallons of water come out of your showerhead in one minute.

Convert liters per minute to gallons per minute?

1 liter per minute is equal to 0.264172052 US gallons per minute.

How many gallons per minute does a shower use?

Showers are often the third greatest water use in a normal home, after toilets and clothes washers. The average American shower flow of 2.1 gallons per minute uses 17.2 gallons (65.1 liters) and lasts 8.2 minutes.

Convert cubic feet per second to gallons per minute?

1 (cubic feet) per second is equal to 448.831169 US gallons per minute.

What are the average gallons per minute for a well?

5 GPM is a fair estimate of peak demand for the average household. Therefore, most households should be able to fulfill their peak and daily water demands with wells that consistently produce 5 GPM.