21 liters in imperial gallons

Conversion

21 liters is equivalent to 4.61935421428084 imperial gallons.^[1]

Conversion formula
How to convert 21 liters to imperial gallons?

We know (by definition) that: $1 liter \approx 0.219969248299088 imperialgallon$

We can set up a proportion to solve for the number of imperial gallons.

\frac{1 liter}{21 liter} \approx \frac{0.219969248299088 imperialgallon}{x imperialgallon}

Now, we cross multiply to solve for our unknown $x$ :

x imperialgallon \approx \frac{21 liter}{1 liter} * 0.219969248299088 imperialgallon \to x imperialgallon \approx 4.619354214280849 imperialgallon

Conclusion: $21 liter \approx 4.619354214280849 imperialgallon$

21 liters is equivalent to 4.61935421428084 imperial gallons

Conversion in the opposite direction

The inverse of the conversion factor is that 1 imperial gallon is equal to 0.216480476190476 times 21 liters.

It can also be expressed as: 21 liters is equal to $\frac{1}{0.216480476190476}$ imperial gallons.

Approximation

An approximate numerical result would be: twenty-one liters is about four point six two imperial gallons, or alternatively, a imperial gallon is about zero point two two times twenty-one liters.

Units involved

This is how the units in this conversion are defined:

Liters

"The litre (British spelling) or liter (American spelling) is an SI accepted metric system unit of volume equal to 1 cubic decimetre (dm3), 1,000 cubic centimetres (cm3) or 1/1,000 cubic metre. A cubic decimetre (or litre) occupies a volume of 10×10×10 centimetres (see figure) and is thus equal to one-thousandth of a cubic metre."

Wikipedia page of liters

Imperial Gallons

"The imperial (UK) gallon, now defined as exactly 4.54609 litres (about 277.42 cubic inches), is used in some Commonwealth countries and was originally based on the volume of 10 pounds (approximately 4.54 kg) of water at 62 °F (17 °C). The imperial fluid ounce is defined as 1⁄160 of an imperial gallon; there are four quarts in a gallon, two pints in a quart, and 20 Imperial fluid ounces in an imperial pint."

Wikipedia page of imperial gallons

Footnotes

[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).

Results may contain small errors due to the use of floating point arithmetic.

Conversion

Conversion formula How to convert 21 liters to imperial gallons?

Conversion in the opposite direction

Approximation

Conversion formula
How to convert 21 liters to imperial gallons?