lb/hr to GPM (Pounds per Hour to Gallons per Minute) Calculator

Last updated: 27 Sep 2025 | Author: Brij | Review By: Irshad

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Easily convert LB/HR to GPM with this calculator. Enter the mass flow rate (lb/hr) and fluid density (lb/gal) to get the volumetric flow rate in gallons per minute (GPM).

Flow Rate (lb/hr):

lb/hr

Pounds per Hour

Fluid Density:

lb/gal

Water: 8.34 lb/gal, Oil: ~7.5 lb/gal

Common Fluids:

Conversion Results

Flow Rate (GPM):

GPM

Gallons per Minute

Calculation Details

Mass Flow Rate: 0 lb/hr

Fluid Density: 0 lb/gal

Hours to Minutes: 1 hour = 60 minutes

Formula: GPM = (lb/hr) ÷ (lb/gal) ÷ 60

Converting mass flow rate (lb/hr) to volumetric flow rate (GPM) is useful in fluid mechanics, chemical processes, and industrial applications. This calculator helps you quickly convert pounds per hour (lb/hr) into gallons per minute (GPM), provided you know the density of the fluid in lb/gal.

Formula to Convert LB/HR to GPM

The basic relationship is:

$GPM = \frac{\text{Flow Rate (lb/hr)}}{\text{Fluid Density (lb/gal)} \times 60}$

Explanation of Formula

Flow Rate (lb/hr): Mass flow of the fluid in pounds per hour.
Fluid Density (lb/gal): The density of the liquid, which allows conversion from mass to volume.
60: Conversion factor from hours to minutes.

Example Conversion

Problem: Convert 600 lb/hr of water (density = 8.34 lb/gal) to GPM.

$GPM = \frac{600}{8.34 \times 60} \\ GPM = \frac{600}{500.4} \\ GPM \approx 1.20$

Answer: The flow rate is approximately 1.20 GPM.

FAQs

1. Why is fluid density important for lb/hr to GPM conversion?

The conversion from lb/hr (mass flow) to GPM (volume flow) requires the fluid's density because pounds measure mass, while gallons measure volume. Different fluids (e.g., water, oil, or chemicals) have different densities values, which significantly affect the result.

2. How is lb/hr to GPM conversion used in construction or industrial applications?

In construction and industrial settings, this conversion is used to size pumps Unofficial or invalid input.

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