Liters per Minute Calculator (L/min)
Find a flow rate in litres per minute by entering the total volume and the time taken — or work backwards to find the volume or time needed.
Solve for
L
min
Volume ÷ time — litres delivered per minute
- 1
Volume given
100Total volume of fluid to deliver - 2
Flow rate (volume ÷ time)
100 ÷ 5 = 20
How does this calculator work?
Flow rate (L/min) = Volume (L) ÷ Time (min). Enter any two of flow rate, volume, and time to solve for the third. The result is also converted to L/s, m³/h, and US GPM. Assumes steady, uniform flow.
Formula
How this is calculated
Volumetric flow rate is the volume of fluid that passes a point per unit of time. The litre per minute (L/min) is the standard unit for everyday fluid flows — garden hoses, shower heads, fuel pumps, and medical oxygen supplies are all commonly rated in L/min.
The formula is simply Q = V / t, where Q is the flow rate, V is the total volume, and t is the elapsed time. Rearranging gives V = Q × t (volume delivered in a given time) and t = V / Q (time to fill a given volume). All three forms are available in the "Solve for" selector.
The calculator also converts the result to litres per second (÷ 60), cubic metres per hour (× 60 ÷ 1000), and US gallons per minute (× 0.26417) so you can match whatever units a specification calls for. This formula assumes steady, uniform flow; in practice, pressure fluctuations and pipe losses can cause the actual flow rate to vary.
Frequently asked questions
Multiply L/min by 0.26417 to get US gallons per minute (GPM). Conversely, multiply GPM by 3.78541 to get L/min.
A standard garden hose delivers roughly 15–30 L/min (4–8 GPM) at normal household water pressure (2.5–4 bar). The actual rate depends on hose diameter, length, and the nozzle fitting used.
Multiply L/min by 0.06 (i.e. × 60 ÷ 1000) to get cubic metres per hour. For example, 20 L/min = 1.2 m³/h.
Also known as
TG we-Calculate Editorial Team. (2026). Liters per Minute Calculator (L/min) [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/liters-per-minute-calculator
TG we-Calculate Editorial Team. "Liters per Minute Calculator (L/min)." TG we-Calculate. 2026. https://we-calculate.com/calculator/liters-per-minute-calculator.
TG we-Calculate Editorial Team, "Liters per Minute Calculator (L/min)," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/liters-per-minute-calculator
@misc{wecalculate_liters_per_minute_calculator, title = {Liters per Minute Calculator (L/min)}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/liters-per-minute-calculator}}, year = {2026}, note = {TG we-Calculate} }
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