Flow Rate Unit Converter
Convert between GPM, m³/h, L/min, and other flow rate units instantly. Essential for pump selection, pipe sizing, and system design.
100 GPM (US gal/min)=22.7125 m³/h
Quick Reference (100 as base)
Common Conversion Formulas
GPM to m³/h
m³/h = GPM * 0.227125
m³/h to GPM
GPM = m³/h * 4.403
GPM to L/min
L/min = GPM * 3.785
L/min to m³/h
m³/h = L/min * 0.06
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View Pumps >Frequently Asked Questions
What is GPM?
GPM stands for Gallons Per Minute. It's a common flow rate unit used in the United States for measuring liquid flow in pumps, pipes, and valves. Note that US gallons differ from Imperial gallons.
How do I convert GPM to m³/h?
To convert GPM to cubic meters per hour (m³/h), multiply the GPM value by 0.227125. For example, 100 GPM = 22.7125 m³/h.
What is the difference between US GPM and Imperial GPM?
US gallons and Imperial gallons are different sizes. 1 US gallon = 3.785 liters, while 1 Imperial gallon = 4.546 liters. Always verify which gallon type is being used in your specifications.
Which flow unit should I use for pump specifications?
It depends on your region and industry standards. US manufacturers typically use GPM, while European and international standards often use m³/h or L/min. Match the unit to your pump datasheet and project requirements.
What is CFM used for?
CFM (Cubic Feet per Minute) is primarily used for gas and air flow measurements, such as in compressors, blowers, and HVAC systems. For liquid applications, GPM or m³/h are more common.
How do I calculate pipe size from flow rate?
Pipe sizing depends on flow rate, velocity, and pressure drop requirements. A general rule is to maintain fluid velocity between 1-3 m/s for liquids. Use our pipe sizing calculator for detailed calculations.
Disclaimer: This calculator provides engineering estimates for reference purposes. Actual product selection should be based on official specifications and engineering standards. Consult with a qualified engineer for critical applications.