To convert US gallons per minute to milliliters per minute, multiply by 3785.411784. 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.
The US standard for pumps, irrigation and fixtures. Laboratory and infusion flow: HPLC pumps and syringe drivers are set in mL/min.
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 milliliters per minute, so you can sanity-check whether your answer is a plausible size.
The formula
US gallons per minute- The amount you are converting, in US gallons per minute
3785.41178421- The exact number of milliliters per minute in one US gallon per minute
milliliters per minute- The converted result
How it works, step by step
- Enter the value in US gallons per minute.
- It is multiplied by 3785.41178421, the exact factor between the two units.
- The answer is shown in milliliters per minute, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A dripping tap: 0.00159 GPM in milliliters per minute
Take a dripping tap, roughly 0.00159 GPM. The conversion is a single multiplication — 0.00159 × 3785.41 — giving 6.0188 mL/min. Because the relationship is proportional, doubling the input doubles the answer to 12.0376 mL/min.
A shower head: 2.54 GPM in milliliters per minute
At 2.54 GPM (a shower head), the same quantity in milliliters per minute is 2.54 × 3785.41 = 9614.95 mL/min. One US gallon per minute is 3785.41 milliliters per minute, so the numbers grow as expected.
How to read your score
Frequently asked questions
How many milliliters per minute are in one US gallon per minute?
Exactly 3785.41178421. 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 milliliters per minute?
milliliters per minute = US gallons per minute × 3785.41178421. Reversed, US gallons per minute = milliliters per minute ÷ 3785.41178421, which is the same as multiplying by 0.000264172052344.
Which is the bigger unit, the US gallon per minute or the milliliter per minute?
The US gallon per minute. One US gallon per minute equals 3785.41 milliliters 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 milliliter per minute?
Laboratory and infusion flow: HPLC pumps and syringe drivers are set in mL/min.
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 mL/min in my head?
Plenty of people do this in their head: multiply by 3800 instead of using the exact factor 3785.411784. At 100 that shortcut gives 380,000 milliliters per minute, off by 1459 milliliters per minute or about 0.39%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Us Gallons Per Minute to milliliters per minute reference tables
| Us Gallons Per Minute | Milliliters Per Minute |
|---|---|
| 0.5 GPM | 1892.71 mL/min |
| 1 GPM | 3785.41 mL/min |
| 2 GPM | 7570.82 mL/min |
| 3 GPM | 11,356.2 mL/min |
| 5 GPM | 18,927.1 mL/min |
| 10 GPM | 37,854.1 mL/min |
| 20 GPM | 75,708.2 mL/min |
| 25 GPM | 94,635.3 mL/min |
| 50 GPM | 189,271 mL/min |
| 75 GPM | 283,906 mL/min |
| 100 GPM | 378,541 mL/min |
| 250 GPM | 946,353 mL/min |
| 500 GPM | 1.89271e+06 mL/min |
| 1000 GPM | 3.78541e+06 mL/min |
| 5000 GPM | 1.89271e+07 mL/min |
Exact factor: 1 US gallon per minute = 3785.41178421 milliliters per minute.
| Quantity | GPM | mL/min |
|---|---|---|
| A dripping tap | 0.001585 GPM | 6 mL/min |
| A bathroom tap | 1.585 GPM | 6000 mL/min |
| A shower head | 2.536 GPM | 9600 mL/min |
| A garden hose | 4.755 GPM | 1.8e+04 mL/min |
| A fire hydrant | 951 GPM | 3.6e+06 mL/min |
| The Thames at London | 1.03e+06 GPM | 3.9e+09 mL/min |
Published reference values, converted with the same factor this page uses.