Imperial gallon

Team Physics -
Created by: Team Physics -, Last Updated: April 25, 2024

Imperial gallon

What is Imperial gallon?

The Imperial gallon is a unit of volume measurement in the British Imperial system. It is equal to 4.54609 liters or approximately 1.20095 U.S. liquid gallons. It’s commonly used in the United Kingdom and some Commonwealth countries for measuring liquids like fuel and beverages.

1 imp . gal = 4.546 liters

Unit of Imperial gallon

The Imperial gallon is a unit of volume in the British Imperial system of measurement. It is denoted by the symbol “gal” or “Imp gal.”

Imperial gallon of 3D Shapes

Cube or Rectangular Prism:

Volume (Imperial gallons) = Length × Width × Height/277.42​


Volume (Imperial gallons) = π × radius² × height/277.42


Volume (Imperial gallons) = 4/3 × π × radius³/277.42

List of Imperial gallon Formulas

ShapeFormulaVolume (in Imperial gallons)
Cube or Rectangular PrismVolume = Length × Width × Height /277.42Volume divided by 277.42
CylinderVolume = π × radius² × height /277.42Volume divided by 277.42
SphereVolume = 4/3 × π × radius³/277.42Volume divided by 277.42

Conversion of Imperial gallon into Other Units

From/To Conversion factor
Imperial Gallons (gal) to Liters (L)1 (gal) = 4.54609 Liters (L)
Imperial Gallons (gal) to Cubic Meters (m³)1 (gal) = 0.00454609 Cubic Meters (m³)
Imperial Gallons (gal) to U.S. Liquid Gallons (gal)1 (gal) = 1.20095 U.S. Liquid Gallons (gal)
Imperial Gallons (gal) to Cubic Feet (ft³)1 (gal) = 0.160544 Cubic Feet (ft³)

Imperial Gallons (gal) = Liters (L)

1 Imperial Gallons (gal) = 4.54609 liter (L)

Imperial Gallons (gal) are converted to Liters (L) using the conversion factor of 1 Imperial gallon ≈ 4.54609 liters, commonly used for liquid volume measurements in the UK.

Imperial Gallons (gal) = Cubic Meters (m³)

1 Imperial Gallons (gal) = 0.00454609 Cubic Meters (m³)

One Imperial gallon is equivalent to approximately 0.00454609 cubic meters. This conversion factor is useful for accurately measuring volumes in both metric and Imperial units.

Imperial Gallons (gal) = U.S. Liquid Gallons (gal)

1 Imperial Gallons (gal) = 1.20095 U.S. Liquid Gallons (gal)

One Imperial gallon is approximately equal to 1.20095 U.S. liquid gallons, indicating a difference in volume between the Imperial and U.S. customary systems.

Imperial Gallons (gal) = Cubic Feet (ft³)

1 Imperial Gallons (gal) = 0.160544 Cubic Feet (ft³)

One Imperial gallon is approximately equivalent to 0.160544 cubic feet, making it a useful conversion for volume measurements in both systems.

Differences b/w Imperial gallon and US gallon

AspectsImperial GallonUS Gallon
DefinitionApproximately 4.54609 litersApproximately 3.78541 liters
Conversion Factor1 Imperial gallon ≈ 1.20095 US gallons1 US gallon ≈ 0.832674 Imperial gallons
Used inUK, some Commonwealth countriesUnited States, some Latin American countries
Symbolgal (Imp gal)gal (US gal)

Example of Imperial gallon

  1. A standard can of paint typically contains around 0.5 Imperial gallons.
  2. An average-sized fish tank might hold approximately 5 Imperial gallons of water.
  3. A large jug of milk at the grocery store may contain 4 Imperial gallons.
  4. A small gasoline canister for lawn mowers usually holds about 2 Imperial gallons.
  5. A medium-sized hot water heater has a capacity of roughly 20 Imperial gallons.
  6. A bathtub might require approximately 40 Imperial gallons of water to fill.
  7. A barrel of crude oil holds about 42 Imperial gallons.
  8. A compact car’s fuel tank has a capacity of around 10 to 12 Imperial gallons.
  9. A standard-sized kitchen sink can typically hold around 10 to 15 Imperial gallons of water.
  10. A backyard swimming pool might have a volume of 400 to 500 Imperial gallons when partially filled.

Uses of Imperial gallon

  1. Liquid Measurements: It’s used in the UK and some Commonwealth countries for measuring liquids like fuel, beverages, and cooking ingredients.
  2. Fuel Consumption: In transportation and automotive industries, it’s used to measure fuel efficiency and consumption in vehicles.
  3. Construction: In construction, it can be used to measure quantities of liquids like paint, concrete mixtures, and other construction materials.
  4. Agriculture: Used in farming for measuring irrigation volumes, fertilizers, and other liquid agricultural inputs.
  5. Manufacturing: Used in industries for measuring liquid raw materials, chemicals, and products.
  6. Brewing and Distilling: In breweries and distilleries, it’s used to measure liquid ingredients and finished products.
  7. Domestic Use: Commonly used in households for measuring liquids like milk, water, and cooking oils.
  8. Retail: In retail settings, it’s used for selling liquids by volume, such as gasoline, milk, and beverages.
  9. Shipping and Transport: Used in logistics and transportation for measuring liquid cargoes and freight volumes.
  10. Environmental Monitoring: In environmental sciences, it’s used to quantify liquid waste, pollution, and contamination levels.


imperial gallon to us gallon

To convert from Imperial gallons to US gallons, you can use the conversion factor:

1 Imperial gallon ≈ 1.20095 US gallons

So, to convert a volume in Imperial gallons to US gallons, you simply multiply the number of Imperial gallons by 1.20095.

Where are Imperial gallons commonly used?

They are prevalent in the UK for measuring liquids like fuel, milk, and beverages, as well as in some Commonwealth countries.

Are Imperial gallons still in use today?

Yes, though some countries, like the UK, have transitioned to using liters in some contexts, Imperial gallons are still used for certain applications.

How accurate are Imperial gallons for measuring volumes?

They provide a reasonably accurate measurement for everyday use, though conversions to metric units are becoming increasingly common for international standardization.

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