21 imperial cups in US customary cups

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

We know (by definition) that: $1\mathrm{brcup}\approx 1.20094992550486\mathrm{uscup}$

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

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

Conclusion: 21 ⁢ brcup ≈ 25.219948435602056 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 0.0396511516489995 times 21 imperial cups.

It can also be expressed as: 21 imperial cups is equal to $\frac{1}{\mathrm{0.0396511516489995}}$ US customary cups.

Approximation

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