What Is the Liters per Minute Calculator?
The Liters per Minute (L/min) Calculator works out a volumetric flow rate — how much liquid moves through a system over time. By entering the total volume in liters and the time in minutes it took to deliver that volume, you instantly see the flow rate, plus equivalents in liters per second and liters per hour. This is useful for sizing pumps, checking faucet or shower flow, irrigation, aquarium water changes, and lab work.
How to Use It
Enter the Volume (liters) that flowed and the Time (minutes) it took. Press calculate to get the flow rate. For example, if you fill a 10‑liter bucket and it takes 30 seconds (0.5 minutes), enter 10 and 0.5 to get 20 L/min.
The Formula Explained
Flow rate is simply volume divided by time:
$$Q = \frac{V}{t}$$
where \(Q\) is flow rate in L/min, \(V\) is volume in liters and \(t\) is time in minutes. To express the result per second, divide by 60; to express it per hour, multiply by 60.
Worked Example
Suppose a tap fills a 120‑liter tank in 4 minutes. The flow rate is $$120 \div 4 = 30 \text{ L/min}$$ That equals \(30 \div 60 = 0.5\) L/s, or \(30 \times 60 = 1{,}800\) L/h.
FAQ
What is a normal kitchen tap flow rate? Modern kitchen faucets typically flow around 6–9 L/min, while older ones may exceed 12 L/min.
How do I measure time accurately? Use a stopwatch and convert seconds to minutes by dividing by 60 (e.g. 30 s = 0.5 min) before entering the value.
Can I use it for gases? The same formula applies to any fluid, but gas flow is often quoted at a reference temperature and pressure, so results assume the measured volume.
