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Instantly calculate flow rate in liters per minute online. Accurate, easy-to-use calculator for water, air, and fluid systems with quick unit conversions.
Calculate flow rate from total volume and time duration. This is the fundamental definition of volumetric flow rate.
Calculate flow rate from fluid velocity and pipe inside diameter using the formula Q = v × A.
Convert between different flow rate units using exact conversion factors.
Calculate volumetric flow rate from mass flow rate and fluid density using Q = ṁ/ρ.
Measuring flow rate can be tricky. Our Liters per Minute Calculator makes it simple. Whether you’re checking water pressure at home or working with fluid systems in a lab, you’ll get fast and accurate results. No guesswork, no math headaches.
Liters per Minute (L/min) tells you how much fluid moves in one minute. It’s a standard way to measure water, air, or any other liquid flow. Imagine filling a 10-liter bucket. If it takes two minutes, the flow rate is 5 L/min. Simple, right?
The most basic formula is:
L/min = Volume (in liters) ÷ Time (in minutes)
Example: If 20 liters of water flows in 4 minutes,
L/min = 20 ÷ 4 = 5 L/min.
For pipe systems, the formula looks like this:
L/min = Velocity × (π × Diameter² ÷ 4) × 60000
Here, velocity is in meters per second, diameter in meters, and 60000 changes cubic meters per second into liters per minute.
You could calculate by hand. But why waste time? Our calculator handles:
It also uses exact conversion factors, so your results match professional engineering standards.
If you’re checking home water flow, measure how long it takes to fill a container. If you’re in a workshop, input your measured velocity and pipe size.
Normal Liters per Minute (NL/min) and Standard Liters per Minute (SL/min) account for temperature and pressure. This matters in gases more than liquids. Standard conditions often mean 0°C and 1 atm. Normal conditions might use 20°C. For water in home systems, you usually just measure actual L/min.
L/min measures flow. PSI or bar measures pressure. They’re related, but you need extra details like pipe size and fluid type to convert between them. For example, higher pressure can push more liters per minute, but the link isn’t a straight one-to-one formula.
For a home tap, 6–12 L/min is common. A shower might run at 9–15 L/min. If you get much less, you may have a blockage or low supply pressure.
A Liters per Minute Calculator is a must-have for plumbers, engineers, or even curious homeowners. It saves time, avoids mistakes, and works for all kinds of fluids. Whether you’re measuring a garden hose or designing a pipeline, you’ll get the right numbers in seconds.
It means one liter flows every minute. That’s about filling a large water bottle each minute.
Divide volume in liters by the time in minutes.
Not always. Too much flow can cause leaks or wear pipes.
Yes, but use standard or normal conditions to be accurate.