21 US customary cups in imperial cups

Conversion formula
How to convert 21 US customary cups to imperial cups?

We know (by definition) that: $1\mathrm{uscup}\approx 0.832674184628989\mathrm{brcup}$

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

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

Conclusion: 21 ⁢ uscup ≈ 17.48615787720877 ⁢ brcup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 imperial cup is equal to 0.0571880916907074 times 21 US customary cups.

It can also be expressed as: 21 US customary cups is equal to $\frac{1}{\mathrm{0.0571880916907074}}$ imperial cups.

Approximation

An approximate numerical result would be: twenty-one US customary cups is about seventeen point four eight imperial cups, or alternatively, a imperial cup is about zero point zero six times twenty-one US customary cups.