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Easily calculate water flow with our Gallons Per Minute Calculator. Learn how to find GPM, convert units, and understand water flow rates.
Ever wondered how fast water flows from your shower, faucet, or hose? That speed is measured in gallons per minute, or GPM. Our Gallons Per Minute Calculator makes it simple. You’ll know exactly how much water you’re using, how long it takes to fill a tub, or how efficient your showerhead is.
Think of it like a stopwatch for water. You enter what you know, and the calculator shows what you don’t.
GPM stands for gallons per minute. It’s a way to measure how much water moves in one minute. For example:
It’s an easy way to compare flow speeds, just like miles per hour shows car speed.
The formula is simple:
GPM = Volume ÷ Time
Say you fill a 5-gallon bucket in 50 seconds. First, turn seconds into minutes:
50 ÷ 60 = 0.83 minutes.
Now divide:
5 ÷ 0.83 ≈ 6 GPM.
So that faucet flows at about 6 gallons per minute.
You don’t need to grab a bucket every time. Our tool does the math for you:
To find flow rate
Enter the volume of water and how long it took to flow. You’ll get GPM right away.
To find volume
Enter the flow rate and the time you’ll run the water. The calculator shows how much water you’ll use.
To find time
Enter the container’s volume and the water’s flow rate. The tool tells you how long it’ll take to fill.
It’s as easy as pie. Input any two values, and the calculator gives you the third.
There’s no single answer because GPM at 60 psi depends on pipe size and fixtures. For example:
So pressure matters, but so does pipe diameter.
Knowing your GPM saves water, time, and money. If your shower runs too high, you’re wasting gallons without noticing. On the flip side, if flow is too low, it feels like standing under a drizzle.
The Gallons Per Minute Calculator is your go-to tool for water flow math. It’s quick, accurate, and works with different units. Whether you’re timing your shower, filling a pool, or checking water pressure, this calculator gives clear answers.
Water math doesn’t need to be tricky. With GPM, you’ll know where your water’s going and how fast.
Divide the volume in gallons by the time in minutes.
If it fills in 1 minute, that’s 5 GPM. If it takes 30 seconds, that’s 10 GPM.
It depends on the pipe size. A ½-inch pipe gives about 14 GPM at 60 psi.
It’s the speed of water measured in gallons per minute.