Quirkulator

Us Gallons Per Minute to Imperial Gallons Per Minute Converter

Convert US gallons per minute to imperial gallons per minute with the exact factor 0.832674, plus real reference values in both units.

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Result in imperial gallons per minute
Adjust the inputs

Your result updates live as you type.

One US gallon per minute is exactly 0.8326741847 imperial gallons per minute, so converting US gallons per minute 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 US standard for pumps, irrigation and fixtures. 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 imperial gallons per minute, so you can sanity-check whether your answer is a plausible size.

The formula

imperial gallons per minute = US gallons per minute × 0.832674184674
US gallons per minute
The amount you are converting, in US gallons per minute
0.832674184674
The exact number of imperial gallons per minute in one US gallon per minute
imperial gallons per minute
The converted result

How it works, step by step

  1. Enter the value in US gallons per minute.
  2. It is multiplied by 0.832674184674, the exact factor between the two units.
  3. The answer is shown in imperial gallons per minute, with the reverse conversion beneath it.
  4. Check the reference table if you want a figure of comparable size.

Worked examples

A fire hydrant: 951 GPM in imperial gallons per minute

A fire hydrant comes to about 951 GPM. Multiplying by the factor: 951 × 0.832674 = 791.873 gpm. Dividing the answer back by 0.832674 returns the figure you started with, which is the quickest way to check you have the factor the right way up.

A dripping tap: 0.00159 GPM in imperial gallons per minute

A dripping tap comes to about 0.00159 GPM. Multiplying by the factor: 0.00159 × 0.832674 = 0.00132395 gpm. Dividing the answer back by 0.832674 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

0–0ZeroZero US gallons per minute is zero imperial gallons per minute.
0–1Under one unitThe answer is less than one imperial gallon per minute.
1–1,000Everyday rangeA typical working figure in imperial gallons per minute.
1,000–—Large valueLarge enough that the exact figure below the gauge is easier to read than the gauge itself.

Frequently asked questions

How many imperial gallons per minute are in one US gallon per minute?

Exactly 0.832674184674. 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 imperial gallons per minute?

imperial gallons per minute = US gallons per minute × 0.832674184674. Reversed, US gallons per minute = imperial gallons per minute ÷ 0.832674184674, which is the same as multiplying by 1.20094992544.

Which is the bigger unit, the US gallon per minute or the imperial gallon per minute?

The imperial gallon per minute. One US gallon per minute is only 0.832674 of a imperial gallon per minute, so it takes 1.20095 US gallons per minute to make one imperial gallon 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 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 GPM to gpm in my head?

Plenty of people do this in their head: divide by 1.2 instead of using the exact factor 0.8326741847. At 100 that shortcut gives 83.333333 imperial gallons per minute, off by 0.06591 imperial gallons per minute or about 0.08%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.

Us Gallons Per Minute to imperial gallons per minute reference tables

Us Gallons Per Minute to imperial gallons per minute conversion table
Us Gallons Per MinuteImperial Gallons Per Minute
0.5 GPM0.416337 gpm
1 GPM0.832674 gpm
2 GPM1.66535 gpm
3 GPM2.49802 gpm
5 GPM4.16337 gpm
10 GPM8.32674 gpm
20 GPM16.6535 gpm
25 GPM20.8169 gpm
50 GPM41.6337 gpm
75 GPM62.4506 gpm
100 GPM83.2674 gpm
250 GPM208.169 gpm
500 GPM416.337 gpm
1000 GPM832.674 gpm
5000 GPM4163.37 gpm

Exact factor: 1 US gallon per minute = 0.832674184674 imperial gallons per minute.

Real volumetric flow figures in US gallons per minute and imperial gallons per minute
QuantityGPMgpm
A dripping tap0.001585 GPM0.00132 gpm
A bathroom tap1.585 GPM1.32 gpm
A shower head2.536 GPM2.112 gpm
A garden hose4.755 GPM3.959 gpm
A fire hydrant951 GPM791.9 gpm
The Thames at London1.03e+06 GPM8.579e+05 gpm

Published reference values, converted with the same factor this page uses.

Related calculators

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