To convert US gallons per minute to cubic meters per minute, multiply by 0.003785411784. That factor is the whole relationship: both units measure volumetric flow, so the conversion is a proportion with no offset and no substance-specific constant.
Compressor and large-fan output in metric markets. The US standard for pumps, irrigation and fixtures.
Standard versus actual volume. Gas flow in CFM depends on pressure and temperature, which is why compressor ratings say SCFM and specify the reference conditions. Converting the number is exact; comparing two ratings measured at different conditions is not. Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into cubic meters per minute, which is usually more useful than the bare number.
The formula
US gallons per minute- The amount you are converting, in US gallons per minute
0.00378541178421- The exact number of cubic meters per minute in one US gallon per minute
cubic meters per minute- The converted result
How it works, step by step
- Enter the value in US gallons per minute.
- It is multiplied by 0.00378541178421, the exact factor between the two units.
- The answer is shown in cubic meters per minute, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A shower head: 2.54 GPM in cubic meters per minute
Take a shower head, roughly 2.54 GPM. The conversion is a single multiplication — 2.54 × 0.00378541 — giving 0.00961495 m³/min. Because the relationship is proportional, doubling the input doubles the answer to 0.0192299 m³/min.
A garden hose: 4.76 GPM in cubic meters per minute
Take a garden hose, roughly 4.76 GPM. The conversion is a single multiplication — 4.76 × 0.00378541 — giving 0.0180186 m³/min. Because the relationship is proportional, doubling the input doubles the answer to 0.0360371 m³/min.
How to read your score
Frequently asked questions
How many cubic meters per minute are in one US gallon per minute?
Exactly 0.00378541178421. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert US gallons per minute to cubic meters per minute?
cubic meters per minute = US gallons per minute × 0.00378541178421. Reversed, US gallons per minute = cubic meters per minute ÷ 0.00378541178421, which is the same as multiplying by 264.172052344.
Which is the bigger unit, the US gallon per minute or the cubic meter per minute?
The cubic meter per minute. One US gallon per minute is only 0.00378541 of a cubic meter per minute, so it takes 264.172 US gallons per minute to make one cubic meter per minute.
What does this quantity actually measure?
Both units measure volumetric flow. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a US gallon per minute?
The US standard for pumps, irrigation and fixtures.
What is a cubic meter per minute?
Compressor and large-fan output in metric markets.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Is there a quick way to do GPM to m³/min in my head?
Plenty of people do this in their head: divide by 260 instead of using the exact factor 0.003785411784. At 100 that shortcut gives 0.38461538 cubic meters per minute, off by 0.006074 cubic meters per minute or about 1.60%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Us Gallons Per Minute to cubic meters per minute reference tables
| Us Gallons Per Minute | Cubic Meters Per Minute |
|---|---|
| 0.5 GPM | 0.00189271 m³/min |
| 1 GPM | 0.00378541 m³/min |
| 2 GPM | 0.00757082 m³/min |
| 3 GPM | 0.0113562 m³/min |
| 5 GPM | 0.0189271 m³/min |
| 10 GPM | 0.0378541 m³/min |
| 20 GPM | 0.0757082 m³/min |
| 25 GPM | 0.0946353 m³/min |
| 50 GPM | 0.189271 m³/min |
| 75 GPM | 0.283906 m³/min |
| 100 GPM | 0.378541 m³/min |
| 250 GPM | 0.946353 m³/min |
| 500 GPM | 1.89271 m³/min |
| 1000 GPM | 3.78541 m³/min |
| 5000 GPM | 18.9271 m³/min |
Exact factor: 1 US gallon per minute = 0.00378541178421 cubic meters per minute.
| Quantity | GPM | m³/min |
|---|---|---|
| A dripping tap | 0.001585 GPM | 6e-06 m³/min |
| A bathroom tap | 1.585 GPM | 0.006 m³/min |
| A shower head | 2.536 GPM | 0.0096 m³/min |
| A garden hose | 4.755 GPM | 0.018 m³/min |
| A fire hydrant | 951 GPM | 3.6 m³/min |
| The Thames at London | 1.03e+06 GPM | 3900 m³/min |
Published reference values, converted with the same factor this page uses.