This page converts imperial gallons per minute into cubic meters per minute using the factor 0.00454609, and shows the reverse figure alongside it. Both units measure volumetric flow, which is why one number does the whole job.
Compressor and large-fan output in metric markets. The British pump unit, about 20% more volume per minute than the US gallon version.
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. The tables underneath give both a plain step-by-step lookup and a list of real quantities expressed in cubic meters per minute, so you can sanity-check whether your answer is a plausible size.
The formula
imperial gallons per minute- The amount you are converting, in imperial gallons per minute
0.00454609- The exact number of cubic meters per minute in one imperial gallon per minute
cubic meters per minute- The converted result
How it works, step by step
- Enter the value in imperial gallons per minute.
- It is multiplied by 0.00454609, 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 fire hydrant: 792 gpm in cubic meters per minute
A fire hydrant comes to about 792 gpm. Multiplying by the factor: 792 × 0.00454609 = 3.6005 m³/min. Dividing the answer back by 0.00454609 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
A shower head: 2.11 gpm in cubic meters per minute
A shower head comes to about 2.11 gpm. Multiplying by the factor: 2.11 × 0.00454609 = 0.00959225 m³/min. Dividing the answer back by 0.00454609 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
How to read your score
Frequently asked questions
How many cubic meters per minute are in one imperial gallon per minute?
Exactly 0.00454609. 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 imperial gallons per minute to cubic meters per minute?
cubic meters per minute = imperial gallons per minute × 0.00454609. Reversed, imperial gallons per minute = cubic meters per minute ÷ 0.00454609, which is the same as multiplying by 219.969248299.
Which is the bigger unit, the imperial gallon per minute or the cubic meter per minute?
The cubic meter per minute. One imperial gallon per minute is only 0.00454609 of a cubic meter per minute, so it takes 219.969 imperial 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 imperial gallon per minute?
The British pump unit, about 20% more volume per minute than the US gallon version.
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 220 instead of using the exact factor 0.00454609. At 100 that shortcut gives 0.45454545 cubic meters per minute, off by 0.000064 cubic meters per minute or about 0.01%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Imperial Gallons Per Minute to cubic meters per minute reference tables
| Imperial Gallons Per Minute | Cubic Meters Per Minute |
|---|---|
| 0.5 gpm | 0.00227305 m³/min |
| 1 gpm | 0.00454609 m³/min |
| 2 gpm | 0.00909218 m³/min |
| 3 gpm | 0.0136383 m³/min |
| 5 gpm | 0.0227304 m³/min |
| 10 gpm | 0.0454609 m³/min |
| 20 gpm | 0.0909218 m³/min |
| 25 gpm | 0.113652 m³/min |
| 50 gpm | 0.227304 m³/min |
| 75 gpm | 0.340957 m³/min |
| 100 gpm | 0.454609 m³/min |
| 250 gpm | 1.13652 m³/min |
| 500 gpm | 2.27305 m³/min |
| 1000 gpm | 4.54609 m³/min |
| 5000 gpm | 22.7305 m³/min |
Exact factor: 1 imperial gallon per minute = 0.00454609 cubic meters per minute.
| Quantity | gpm | m³/min |
|---|---|---|
| A dripping tap | 0.00132 gpm | 6e-06 m³/min |
| A bathroom tap | 1.32 gpm | 0.006 m³/min |
| A shower head | 2.112 gpm | 0.0096 m³/min |
| A garden hose | 3.959 gpm | 0.018 m³/min |
| A fire hydrant | 791.9 gpm | 3.6 m³/min |
| The Thames at London | 8.579e+05 gpm | 3900 m³/min |
Published reference values, converted with the same factor this page uses.