gpm to l-min | Exact Decimal + Formula

1 US Gallon / Minute = 3.785412 Liter / Minute

One US gallon / minute equals about 3.79 liters / minute (exactly 3.785412 L/min). Real-world use: well pumps, pool pumps, and irrigation systems in the united states. This page expresses those values in liters / minute, which is used for water pumps, medical iv infusion, and aquarium filtration ratings. Use the calculator above, then check the reference table for common values from 0.001 to 1000.

About US Gallon / Minute and Liter / Minute

US Gallon / Minute (gpm)

US gallons per minute measures flow in imperial units; one GPM is about 3.785 L/min.

Where it's used: Well pumps, pool pumps, and irrigation systems in the United States.

Liter / Minute (L/min)

Liters per minute measures volumetric flow rate in the metric system.

Where it's used: Water pumps, medical IV infusion, and aquarium filtration ratings.

Flow Rate Converter

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Precision

Formula

L/min = gpm × 3.785412

To convert US Gallon / Minute to Liter / Minute, use the formula displayed above.

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US Gallon / Minute to Liter / Minute: Quick Reference Table

US Gallon / Minute	Liter / Minute (Decimal)	Fraction	Real-world equivalent
0.001 gpm	0.003785 L/min	-	fractional unit measurement
0.01 gpm	0.037854 L/min	-	fractional unit measurement
0.1 gpm	0.378541 L/min	-	fractional unit measurement
0.5 gpm	1.892706 L/min	-	standard single unit scale
1 gpm	3.785412 L/min	-	standard single unit scale
2 gpm	7.570824 L/min	-	standard single unit scale
5 gpm	18.92706 L/min	-	multiple unit increments
10 gpm	37.85412 L/min	-	multiple unit increments
25 gpm	94.6353 L/min	-	multiple unit increments
50 gpm	189.2706 L/min	-	multiple unit increments
100 gpm	378.5412 L/min	-	multiple unit increments
250 gpm	946.353 L/min	-	multiple unit increments
500 gpm	1892.706 L/min	-	multiple unit increments
1000 gpm	3785.412 L/min	-	multiple unit increments

gpm to L/min Formula and Examples

Direct Formula L/min = gpm × 3.785412

Inverse Formula gpm = L/min × 0.264172

Mental Math Shortcut

Multiply the value by roughly 3.8 to calculate the equivalent amount in your head.

Common US Gallon / Minute to Liter / Minute Calculations

5 gpm = 18.92706 L/min
10 gpm = 37.85412 L/min
50 gpm = 189.2706 L/min
100 gpm = 378.5412 L/min
500 gpm = 1892.706 L/min

Precision & Practical Use

For example, 10 gpm = 37.85412 L/min — roughly multiple unit increments.

Results are computed to up to 9 decimal places. Round to the precision of your measuring instrument — for most flow rate applications, 2–3 significant figures are plenty.

Related Specialist Flow Rate Calculators & Niche Tools

Flow rate calculations measure fluid velocity, expressing volume per unit time. Typically calculated in Gallons per Minute (GPM) or Liters per Minute (LPM), these measurements are fundamental in plumbing, irrigation, and hydraulic system design.

Sizing a water pump or designing a sprinkler system requires translating fluid flow rates across metric and imperial systems. Flow calculators allow plumbers and civil engineers to determine if piping and valve sizes can handle specific GPM or LPM rates under pressure, optimizing fluid transport systems for peak output.

Flow gpm to lpm Convert liquid flow rates.

How to Convert US Gallon / Minute to Liter / Minute

How many liter / minutes are in one us gallon / minute?

One US Gallon / Minute (gpm) equals 3.785412 Liter / Minute (L/min). To convert us gallon / minutes to liter / minutes, multiply the us gallon / minute value by 3.785412.

How do I convert US Gallon / Minute to Liter / Minute?

Multiply your us gallon / minute value by 3.785412 to get the result in Liter / Minute: L/min = gpm × 3.785412. For example, 5 gpm = 18.92706 L/min.

What is the formula for converting gpm to L/min?

The conversion formula is L/min = gpm × 3.785412. Use the calculator above for any value, and see the reference table below for common inputs from 0.001 to 1000.

Is there a quick mental estimate for gpm to L/min?