Flow Rate Converter

Convert volumetric flow rate between liters per minute, gallons per minute (GPM), cubic meters per hour, cubic feet per minute (CFM) and more.

How to use the Flow Rate Converter

  1. Type the value you want to convert in the first box.
  2. Choose the unit you are converting from and the unit you want to convert to.
  3. Read the result instantly. Use the swap button to reverse the direction, or copy the result with one click.

Popular flow rate conversions

ConversionResultFormula
Liters per minute to US gallons per minute1 L/min = 0.264172 GPMUS gallons per minute = liters per minute × 0.26417205
US gallons per minute to liters per minute1 GPM = 3.78541 L/minliters per minute = US gallons per minute × 3.7854118
Cubic meters per hour to liters per minute1 m³/h = 16.6667 L/minliters per minute = cubic meters per hour × 16.666667
Liters per minute to cubic meters per hour1 L/min = 0.06 m³/hcubic meters per hour = liters per minute × 0.06
Cubic feet per minute to cubic meters per hour1 CFM = 1.69901 m³/hcubic meters per hour = cubic feet per minute × 1.6990108
Cubic meters per hour to cubic feet per minute1 m³/h = 0.588578 CFMcubic feet per minute = cubic meters per hour × 0.58857778
US gallons per minute to cubic meters per hour1 GPM = 0.227125 m³/hcubic meters per hour = US gallons per minute × 0.22712471
Cubic meters per hour to US gallons per minute1 m³/h = 4.40287 GPMUS gallons per minute = cubic meters per hour × 4.4028675
Liters per second to liters per minute1 L/s = 60 L/minliters per minute = liters per second × 60
Liters per minute to liters per second1 L/min = 0.0166667 L/sliters per second = liters per minute ÷ 60
Cubic feet per minute to liters per second1 CFM = 0.471947 L/sliters per second = cubic feet per minute × 0.47194744
Liters per second to cubic feet per minute1 L/s = 2.11888 CFMcubic feet per minute = liters per second × 2.11888

Supported flow rate units

UnitSymbolEqual to
Cubic meter per secondm³/s1 m³/s
Cubic meter per minutem³/min0.016666667 m³/s
Cubic meter per hourm³/h0.00027777778 m³/s
Cubic meter per daym³/d0.000011574074 m³/s
Liter per secondL/s0.001 m³/s
Liter per minuteL/min0.000016666667 m³/s
Liter per hourL/h0.000000277778 m³/s
Milliliter per minutemL/min0.000000016667 m³/s
Milliliter per secondmL/s0.000001 m³/s
US gallon per minuteGPM0.000063090196 m³/s
US gallon per hourGPH0.000001051503 m³/s
Imperial gallon per minuteimp gal/min0.000075768167 m³/s
Cubic foot per secondft³/s0.028316847 m³/s
Cubic foot per minuteCFM0.00047194744 m³/s
Barrel per day (oil)bbl/d0.000001840131 m³/s

Volumetric flow rate

Flow rate is the volume of fluid that passes a point per unit of time. Pumps, taps and showers are rated in liters per minute or gallons per minute; fans and ventilation in cubic feet per minute (CFM) or cubic meters per hour; rivers in cubic meters or cubic feet per second.

  • 1 US GPM = 3.785 L/min
  • 1 m³/h = 16.667 L/min
  • 1 CFM = 1.699 m³/h

Flow rate equals the cross-section area of the pipe multiplied by the average velocity of the fluid, so halving a pipe’s diameter at the same velocity cuts the flow to a quarter.

Frequently asked questions

How do I convert L/min to GPM?

Divide liters per minute by 3.78541. For example, 20 L/min is about 5.28 US GPM.

How do I convert CFM to m³/h?

Multiply CFM by 1.69901. For example, 100 CFM is about 169.9 m³/h.

How many liters per minute is 1 m³/h?

One cubic meter per hour is about 16.667 liters per minute.

Related tools