Enter the pounds per hour (lb/hr) and the density of the fluid into the calculator to determine the gallons per minute (GPM).

LB/Hr to GPM Formula

The following formula is used to calculate the GPM from lb/hr. 

GPM = lb/hr / D / 60
  • Where GPM is the gallons per minute
  • lb/hr is the pounds per hour
  • D is the density of the fluid (lbs/gallon)

To calculate the GPM from lb/hr, divide the pounds per hour by the density of the fluid in pounds per gallon, then divide that result by 60.

LB/Hr to GPM Conversion

Converting lb/hr to GPM is the conversion of a weight per time to a volume per time. As a result, to convert between the two, the weight must be divided by the density to get volume, and then the hours must be divided by 60 to get minutes.

How to conver lb/hr to gpm?

Example Problem:

The following example problem outlines how to calculate gpm from lb/hr.

First, determine the lb/hr. In this example, the pounds per hour is 5000.

Next, determine the density of the fluid. In this case, the fluid is water, so the density is 8.345 lbs/gallon.

Finally, calculate the gpm using the formula above:

GPM = lb/hr / D / 60

GPM = 5000 / 8.345 / 60

GPM = 9.986