Flow Meter Conversion Chart PDF: Instantly Convert GPM, LPM, and M3/H Volumetric Rates

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DateTime 09/13/2026 Show 25

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Flow Meter Conversion Chart PDF: Instantly Convert GPM, LPM, and M3/H Volumetric Rates

Quick Answer

Convert GPM to LPM by multiplying by 3.78541. Convert m3/h to LPM by multiplying by 16.6667. Silver Instruments supplies a free flow meter conversion chart PDF for engineers and procurement teams who need a fast field reference without opening an app. The chart covers volumetric flow rate conversion for GPM, LPM, and m3/h.


Why a Printed Flow Meter Conversion Chart Still Works

A pump curve may show m3/h. A flow meter may display LPM. A control room may record GPM. This mix causes mistakes. We have seen this on customer sites many times. In a paint factory in Vietnam, a batch ticket asked for 60 LPM. The operator set the pump to 60 GPM. That is 227 LPM. The batch was ruined. A one page conversion chart near the pump solved the problem.


Most engineers skip this part. They trust the PLC conversion. But during commissioning or calibration, you need a manual check. The PDF chart works even when the HART signal is not stable. In practice, a paper chart next to a flow meter display saves time and reduces operator error.


GPM to LPM and M3/H Formulas

Here are the base formulas. Keep them in your logbook.


LPM equals GPM multiplied by 3.78541. M3/h equals LPM multiplied by 0.06. GPM equals m3/h multiplied by 4.40287.


Example: 50 GPM equals 189.27 LPM. Example: 10 m3/h equals 166.67 LPM. Example: 300 LPM equals 18 m3/h. The chart includes common values from 0.5 GPM to 2000 GPM and 0.1 m3/h to 500 m3/h.


Common Pipe Sizes and Flow Ranges

DN15 to DN50 lines often run between 2 and 120 LPM. DN80 to DN150 lines commonly run from 10 to 400 m3/h depending on fluid. A seawater desalination plant in Saudi Arabia needed a flow meter for 250 m3/h feed water. That is 4166.7 LPM. We proposed an electromagnetic flow meter on a DN150 line. Before quoting, we asked for pipe size, pressure, and temperature. This is the right way.


For a dairy plant in New Zealand, the cle

Flow Meter Conversion Chart PDF: Instantly Convert GPM, LPM, and M3/H Volumetric Rates
aning loop ran at 85 degrees Celsius. That changes the choice of liner and electrode. We supplied a flow meter with PTFE liner and 316L electrodes. Because the flow range was 8 to 40 m3/h, a DN50 electromagnetic flow meter matched well.


Recommended Silver Instruments Flow Meters by Fluid

For clean water and wastewater, use an electromagnetic flow meter. It outputs volumetric flow in m3/h, LPM, or GPM directly. For diesel and lubricating oil, use an oval gear flow meter. It measures actual volume with high repeatability. A customer in Malaysia ordered an oval gear flow meter for a palm oil line at DN40, 10 bar, 80 degrees Celsius, and 30 LPM. For gas or steam, use a vortex flow meter. If the area is ATEX Zone 1, specify the approval at order time. For syrup, paste, or molasses, a Coriolis mass flow meter gives mass flow and density. We can set the local display unit before shipment.


All units can be configured through the local display or 4-20 mA HART. We calibrate each meter to your specified range at our facility.


How to Get the Flow Meter Conversion Chart PDF

Send us your pipe size in DN, fluid type, pressure in bar, temperature in Celsius, and flow range in m3/h or LPM. We will send the PDF conversion chart and a matching flow meter quote. Contact Silver Automation Instruments at Tel: +86-25-68650347, Whatsapp: +86-25-52155837, WeChat: +86 15365082610. You can also visit flow-meter.com.au.


Frequently Asked Questions

How do I convert GPM to LPM? Multiply GPM by 3.78541. 20 GPM is 75.71 LPM.


How do I convert m3/h to GPM? Multiply m3/h by 4.40287. 50 m3/h is 220.14 GPM.


What is the formula for m3/h to LPM? Multiply m3/h by 16.6667. 12 m3/h is 200 LPM.


Does the flow meter display units change? Most Silver Instruments flow meters let you change the engineering unit through the local display or HART menu.


Can I use the chart for mass flow units? No. This chart is for volumetric flow only. For mass flow, use density and temperature compensation.


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