gpm to m3-s | Exact Decimal + Formula

1 US Gallon / Minute = 0.000063 Cubic Meter / Second

One cubic meter / second equals about 15.9 thousand US gallons / minute (exactly 15850.32224 gpm). Real-world use: well pumps, pool pumps, and irrigation systems in the united states. This page expresses those values in cubic meters / second, which is used for river discharge, dam turbine capacity, and HVAC air volumes. Type a value above for an instant answer; the exact formula and the reference table are below.

About US Gallon / Minute and Cubic Meter / Second

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.

Cubic Meter / Second (m³/s)

Cubic meters per second is the SI unit of volumetric flow.

Where it's used: River discharge, dam turbine capacity, and HVAC air volumes.

Flow Rate Converter

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Precision

Formula

m³/s = gpm × 0.00006309

To convert US Gallon / Minute to Cubic Meter / Second, use the formula displayed above.

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US Gallon / Minute to Cubic Meter / Second: Quick Reference Table

US Gallon / Minute	Cubic Meter / Second (Decimal)	Fraction	Real-world equivalent
0.001 gpm	6.3090e-8 m³/s	-	fractional unit measurement
0.01 gpm	6.3090e-7 m³/s	-	fractional unit measurement
0.1 gpm	0.000006 m³/s	-	fractional unit measurement
0.5 gpm	0.000032 m³/s	-	fractional unit measurement
1 gpm	0.000063 m³/s	-	fractional unit measurement
2 gpm	0.000126 m³/s	-	fractional unit measurement
5 gpm	0.000315 m³/s	-	fractional unit measurement
10 gpm	0.000631 m³/s	-	fractional unit measurement
25 gpm	0.001577 m³/s	-	fractional unit measurement
50 gpm	0.003155 m³/s	-	fractional unit measurement
100 gpm	0.006309 m³/s	-	fractional unit measurement
250 gpm	0.015773 m³/s	-	fractional unit measurement
500 gpm	0.031545 m³/s	-	fractional unit measurement
1000 gpm	0.06309 m³/s	-	fractional unit measurement

gpm to m³/s Formula and Examples

Direct Formula m³/s = gpm × 0.00006309

Inverse Formula gpm = m³/s × 15850.322237

Mental Math Shortcut

Divide the value by roughly 15850.3 to quickly estimate the converted result.

Common US Gallon / Minute to Cubic Meter / Second Calculations

5 gpm = 0.000315 m³/s
10 gpm = 0.000631 m³/s
50 gpm = 0.003155 m³/s
100 gpm = 0.006309 m³/s
500 gpm = 0.031545 m³/s

Precision & Practical Use

For example, 10 gpm = 0.000631 m³/s — roughly fractional unit measurement.

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 Cubic Meter / Second

How many cubic meter / seconds are in one us gallon / minute?

One US Gallon / Minute (gpm) equals 0.000063 Cubic Meter / Second (m³/s). To convert us gallon / minutes to cubic meter / seconds, multiply the us gallon / minute value by 0.000063.

How do I convert US Gallon / Minute to Cubic Meter / Second?

Multiply your us gallon / minute value by 0.000063 to get the result in Cubic Meter / Second: m³/s = gpm × 0.000063. For example, 5 gpm = 0.000315 m³/s.

What is the formula for converting gpm to m³/s?

The conversion formula is m³/s = gpm × 0.000063. 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 m³/s?