You’re standing in your lush backyard on a sunny Saturday afternoon, excited to fill your new pool.
You put the hose in and leave it for a while. When you return in an hour excited to swim, you realize the pool is only half full.
Ugh.
That is when the flow rate comes in handy, so you are here using our gallons per minute calculator instead of enjoying the swim. I feel for you…
Gallons Per Minute Formula
Gallons per minute (GPM) measures the flow rate of a liquid, indicating how many gallons pass a point in one minute.
To calculate GPM, you can use the following formula:
GPM = Total Gallons / Total Time- Total Gallons: The total volume of liquid that has flowed.
- Total Time: The total time over which the liquid has flowed.
To calculate the GPM, you must convert the Total Time into minutes. For this, you would use the following conversion factors:
- Seconds to Minutes: Divide the time in seconds by 60 to convert to minutes.
- Hours to Minutes: Multiply the time in hours by 60 to convert to minutes.
Say you had a total time of 120 seconds. Using the formula, divide it by 60, and you get 2 minutes. When the total time is 3 hours, you would multiply it by 60. So, 3 hours is 180 minutes.
GPM Example Calculation
Let’s say you have a tank that fills with 1,500 gallons of water in 1.5 hours.
Here’s how you would calculate the GPM.
First, let’s convert 1.5 hours into minutes:
Total Time In Minutes = 1.5 * 60 = 90 minutesNow we can calculate the GPM:
GPM = 1,500 / 90 = ~16.67The flow rate filling the tank is ~16,67GPM.
Converting 1GPM into LPM
The standard US gallon is 3.785 liters. To convert 1GPM, you need to multiply it by that value. So 1GPM = 3.785 LPM.
What Is The Typical Garden Hose GPM?
A typical garden hose has a water flow of about 17 GPM for the following parameters: 5/8″, 50 ft in length, and 50 PSI of water pressure. However, the GPM can be significantly affected by all of these variables.