Welcome to our Mass Flow Rate Converter, a precise and easy-to-use online tool that allows you to instantly convert kg/hr to GPM (gallons per minute) and GPM to kg/hr.

Whether you’re working in fluid dynamics, chemical processing, HVAC systems, or water treatment, this tool ensures accurate and instant conversions between mass flow rate and volumetric flow rate — all in one place.

 

What is a Mass Flow Rate?

Mass flow rate measures the amount of mass flowing through a system per unit of time. It tells you how much fluid (in kilograms) passes through a pipe, valve, or equipment every hour or second.

The SI unit for mass flow rate is kilograms per hour (kg/hr) or sometimes kilograms per second (kg/s).

Example:
If water is flowing at 3,600 kg/hr, it means 3,600 kilograms of water move through the system every hour.

 

What is a Volumetric Flow Rate (GPM)?

GPM (Gallons Per Minute) is a volumetric flow rate unit used primarily in Imperial (U.S.) systems. It measures the volume of fluid flowing through a pipe or pump every minute.

Example:
A pump rated at 10 GPM moves 10 U.S. gallons of fluid per minute through the system.

GPM is widely used in:

Water and wastewater management

Hydraulic and cooling systems

HVAC flow calculations

Industrial process control

 

Conversion Between kg/hr and GPM

The conversion between kg/hr (mass flow) and GPM (volumetric flow) depends on the density of the fluid being used.

For water at room temperature (density ≈ 1,000 kg/m³), the following formulas apply:

These formulas assume standard water conditions (at ~20°C), where the density of water is close to 1 kg/L.

Example Conversions:

 

How to Use the Mass Flow Rate Converter

Our kg/hr to GPM converter is designed to be simple and efficient:

Select your conversion direction (kg/hr → GPM or GPM → kg/hr).

Enter the numeric value you want to convert and hit button.

The tool instantly displays your converted result.

✅ No manual math
✅ Instant output
✅ Accurate results

You can also use the converter for water, liquids with similar density, or by adjusting based on custom fluid densities (for more advanced users).

 

Why Use Our kg/hr to GPM Converter Tool?

Here’s why professionals rely on this converter:

✅ Accurate & Instant Results – Uses the official standard conversion constants for water.
✅ Supports Reverse Conversion – Convert both kg/hr to GPM and GPM to kg/hr instantly.
✅ Industry-Friendly Design – Built for HVAC, fluid mechanics, oil & gas, and chemical engineers.
✅ Easy to Use – No technical setup; just enter values and get results.
✅ Free & Mobile Responsive – Works perfectly on all devices.

 

Quick Conversion Reference Table (Water)

 

Frequently Asked Questions (FAQs)​

This assumes the fluid is water at room temperature.

1. How do you convert GPM to kg/hr?

Multiply your GPM value by 227.1247 to get kg/hr.

2. What does kg/hr mean?

It’s the mass flow rate — how many kilograms of a substance pass through a system in one hour.

3. What does GPM mean?

It stands for gallons per minute, a measure of how many U.S. gallons of fluid flow through a system in one minute.

4. Does the converter work for fluids other than water?

Yes, but you need to adjust for the fluid’s density. The provided values are accurate for water.

 

The Mass Flow Rate Converter (kg/hr ↔ GPM) is a powerful, precise, and easy-to-use tool for engineers, scientists, and industry professionals who need fast conversions between mass flow rate (kg/hr) and volumetric flow rate (GPM).

Whether you need to convert kg/hr to gallons per minute, kg/h to GPM, or GPM to kg/hr, this converter delivers accurate, instant results every time.

Ideal for use in HVAC systems, fluid mechanics, chemical processing, and pump design, this tool ensures your calculations are efficient, consistent, and error-free.

Try it now and make your flow rate conversions simpler, faster, and more reliable.