Flow Rate Converter

Convert flow rate measurements between cubic meters per second, liters per second/minute/hour, gallons per minute and cubic feet per minute.

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Value

FromTo

Result

1000 L/s

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How It Works

How this flow rate converter works

This tool converts between flow rate units using fixed conversion factors, for example, 1 gallon per minute (US) equals about 3.785 liters per minute, and 1 cubic foot per minute equals about 28.317 liters per minute. Enter a value in any supported unit and it's converted to all others using these standard ratios.

When each flow rate unit is used

Liters per second and cubic meters per second are the SI standard, common in engineering and scientific contexts. Gallons per minute (GPM) is widely used in the US for pumps, faucets and irrigation, while cubic feet per minute (CFM) is standard for airflow ratings on fans, HVAC equipment and compressors.

Worked example

Converting a 5 GPM well pump's output to liters per minute gives approximately 18.93 L/min (5 × 3.78541), useful for comparing a US-spec pump rating against equipment documented in metric units.

Common Mistakes to Avoid

Using GPM (a liquid flow unit) and CFM (an airflow unit) interchangeably, they measure flow of fundamentally different substances, a pump rated in GPM and a fan rated in CFM aren't directly comparable even after unit conversion.

Confusing gallons per minute with gallons per hour when reading a spec sheet, missing that distinction produces a result 60 times too large or small.

Assuming US and UK imperial gallons give the same GPM conversion, this tool's GPM unit uses the US gallon (3.78541 L), a UK imperial gallon (4.546 L) would need a different conversion factor entirely.

Frequently Asked Questions

How do I convert GPM to liters per minute?

Multiply gallons per minute (US) by 3.78541 to get liters per minute, or use this converter for an instant result.

Is CFM used for liquids or air?

CFM (cubic feet per minute) is almost always used for airflow, such as fan, blower or HVAC ratings, while GPM and liters per minute are more commonly used for liquid flow.

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How It Works

How this flow rate converter works

When each flow rate unit is used

Worked example

Converting a 5 GPM well pump's output to liters per minute gives approximately 18.93 L/min (5 × 3.78541), useful for comparing a US-spec pump rating against equipment documented in metric units.

Common Mistakes to Avoid

Confusing gallons per minute with gallons per hour when reading a spec sheet, missing that distinction produces a result 60 times too large or small.

Frequently Asked Questions

How do I convert GPM to liters per minute?

Multiply gallons per minute (US) by 3.78541 to get liters per minute, or use this converter for an instant result.

Is CFM used for liquids or air?

CFM (cubic feet per minute) is almost always used for airflow, such as fan, blower or HVAC ratings, while GPM and liters per minute are more commonly used for liquid flow.