One liter per second is exactly 13.1981549 imperial gallons per minute, so converting liters per second to imperial gallons per minute is a single multiplication. Enter any figure and the result appears as you type — the arithmetic runs in your browser, so nothing is sent anywhere.
The British pump unit, about 20% more volume per minute than the US gallon version. Used for plumbing design and compressed air.
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 imperial gallons per minute, which is usually more useful than the bare number.
The formula
liters per second- The amount you are converting, in liters per second
13.1981548979- The exact number of imperial gallons per minute in one liter per second
imperial gallons per minute- The converted result
How it works, step by step
- Enter the value in liters per second.
- It is multiplied by 13.1981548979, the exact factor between the two units.
- The answer is shown in imperial gallons per minute, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A garden hose: 0.3 L/s in imperial gallons per minute
Take a garden hose, roughly 0.3 L/s. The conversion is a single multiplication — 0.3 × 13.1982 — giving 3.95945 gpm. Because the relationship is proportional, doubling the input doubles the answer to 7.91889 gpm.
The Thames at London: 6.5e+04 L/s in imperial gallons per minute
The Thames at London comes to about 6.5e+04 L/s. Multiplying by the factor: 6.5e+04 × 13.1982 = 857,880 gpm. Dividing the answer back by 13.1982 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 imperial gallons per minute are in one liter per second?
Exactly 13.1981548979. 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 liters per second to imperial gallons per minute?
imperial gallons per minute = liters per second × 13.1981548979. Reversed, liters per second = imperial gallons per minute ÷ 13.1981548979, which is the same as multiplying by 0.0757681666667.
Which is the bigger unit, the liter per second or the imperial gallon per minute?
The liter per second. One liter per second equals 13.1982 imperial gallons 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 liter per second?
Used for plumbing design and compressed air.
What is a imperial gallon per minute?
The British pump unit, about 20% more volume per minute than the US gallon version.
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 L/s to gpm in my head?
Plenty of people do this in their head: multiply by 13 instead of using the exact factor 13.1981549. At 100 that shortcut gives 1300 imperial gallons per minute, off by 19.82 imperial gallons per minute or about 1.50%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Liters Per Second to imperial gallons per minute reference tables
| Liters Per Second | Imperial Gallons Per Minute |
|---|---|
| 0.5 L/s | 6.59908 gpm |
| 1 L/s | 13.1982 gpm |
| 2 L/s | 26.3963 gpm |
| 3 L/s | 39.5945 gpm |
| 5 L/s | 65.9908 gpm |
| 10 L/s | 131.982 gpm |
| 20 L/s | 263.963 gpm |
| 25 L/s | 329.954 gpm |
| 50 L/s | 659.908 gpm |
| 75 L/s | 989.862 gpm |
| 100 L/s | 1319.82 gpm |
| 250 L/s | 3299.54 gpm |
| 500 L/s | 6599.08 gpm |
| 1000 L/s | 13,198.2 gpm |
| 5000 L/s | 65,990.8 gpm |
Exact factor: 1 liter per second = 13.1981548979 imperial gallons per minute.
| Quantity | L/s | gpm |
|---|---|---|
| A dripping tap | 0.0001 L/s | 0.00132 gpm |
| A bathroom tap | 0.1 L/s | 1.32 gpm |
| A shower head | 0.16 L/s | 2.112 gpm |
| A garden hose | 0.3 L/s | 3.959 gpm |
| A fire hydrant | 60 L/s | 791.9 gpm |
| The Thames at London | 6.5e+04 L/s | 8.579e+05 gpm |
Published reference values, converted with the same factor this page uses.