How many liters are in 1 imperial gallon?

1 imperial gallon equals 4.54609 L.

How do I convert liters back to imperial gallons?

Use the reverse converter: 1 liter equals 0.219969 imp gal.

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert imperial gallons to liters, multiply the value by 4.54609.

L = imp gal × 4.54609

40 imp gal × 4.54609 = 181.84 L

Imperial Gallon (imp gal): The UK imperial gallon, defined in 1824 and now exactly 4.54609 litres. Still seen in UK fuel economy figures.
Liter (L): The common metric unit for liquids such as drinks and fuel. Equal to one cubic decimetre, accepted for use with the SI.

How do I convert imperial gallons to liters?: To convert imperial gallons to liters, multiply the value by 4.54609.
How many liters are in 1 imperial gallon?: 1 imperial gallon equals 4.54609 L.
How many liters are in 10 imperial gallons?: 10 imp gal equals 45.4609 L.
How do I convert liters back to imperial gallons?: Use the reverse converter: 1 liter equals 0.219969 imp gal.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.