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Gallon (imperial) (imp gal)

Exactly 4.54609 liters.

What is an imperial gallon?

Symbol
imp gal
Quantity
Volume
Unit system
imperial
Definition
Exactly 4.54609 liters.
Exact
Yes, the value is exact by definition
Source
Weights and Measures Act 1985 (UK): imperial gallon = 4.54609 liters

Common applications

Used in the United Kingdom for fuel economy figures (miles per gallon) and in some Commonwealth countries.

Gallon (imperial) in other volume units

Gallon (imperial) quick reference

Gallon (imperial) in other units
Gallon (imperial)LiterGallon (US liquid)Milliliter
1 imp gal= 4.54609 L≈ 1.200949926 gal= 4546.09 mL
10 imp gal= 45.4609 L≈ 12.00949926 gal= 45460.9 mL
100 imp gal= 454.609 L≈ 120.0949926 gal= 454609 mL
1000 imp gal= 4546.09 L≈ 1200.949926 gal= 4546090 mL

Where the imperial gallon fits

The next smaller volume unit is the US gallon (gal). 1 imp gal ≈ 1.200949926 gal, and 1 gal ≈ 0.8326741846 imp gal.

The next larger volume unit is the cubic foot (ft³). 1 imp gal ≈ 0.1605436532 ft³, and 1 ft³ ≈ 6.228835459 imp gal.

Frequently asked questions

How many liters are in one imperial gallon?
One imperial gallon = 4.54609 L (liters).
How many US gallons are in one imperial gallon?
One imperial gallon ≈ 1.200949926 gal (US gallons).
How many milliliters are in one imperial gallon?
One imperial gallon = 4546.09 mL (milliliters).