Enter your Volume of Water and Time to Fill to calculate your flow rate in Gallons Per Minute (GPM). You'll also get the converted flow rates in Gallons Per Hour (GPH), Liters Per Minute (LPM), and Liters Per Hour (LPH) all at once.
Gallons Per Minute (GPM)
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Gallons Per Hour (GPH)
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Liters Per Minute (LPM)
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Liters Per Hour (LPH)
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GPM stands for gallons per minute, which is a unit of volumetric flow rate that measures how many gallons of liquid flow through a given point in one minute. It's commonly used to measure water flow in plumbing, pumps, and irrigation systems.
To calculate GPM, divide the volume of water in gallons by the time in minutes. If you have time in seconds, divide by 60 first to convert to minutes. The formula is: GPM = Volume (gallons) ÷ Time (minutes).
A typical shower uses between 2.5 to 5 GPM. Low-flow showerheads are designed to use 2.5 GPM or less to conserve water, while older showerheads may use up to 5 GPM or more.
A standard garden hose typically flows at 9-17 GPM depending on water pressure and hose diameter. A 5/8-inch hose usually delivers about 17 GPM at 25 PSI, while a 1/2-inch hose delivers about 9 GPM.
1 GPM equals approximately 3.785 liters per minute (LPM). This conversion factor comes from the fact that 1 US gallon equals 3.785 liters.
A typical bathroom sink faucet flows at 1.5-2.2 GPM, while a kitchen sink faucet usually flows at 2.2 GPM. Modern low-flow faucets are designed to use 1.5 GPM or less to conserve water.
To measure GPM at home, use a container of known volume (like a 1-gallon bucket) and time how long it takes to fill. Then use the formula: GPM = Volume in gallons ÷ Time in minutes. For example, if it takes 30 seconds to fill a 1-gallon container, that's 2 GPM.