21 imperial quarts in US gallons

Conversion formula
How to convert 21 imperial quarts to US gallons?

We know (by definition) that: $1\mathrm{imperialquart}\approx 0.300237481376214\mathrm{usgallon}$

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

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

Conclusion: 21 ⁢ imperialquart ≈ 6.304987108900494 ⁢ usgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US gallon is equal to 0.158604606595998 times 21 imperial quarts.

It can also be expressed as: 21 imperial quarts is equal to $\frac{1}{\mathrm{0.158604606595998}}$ US gallons.

Approximation

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