399 imperial cups in US customary cups

Conversion formula
How to convert 399 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: 399 ⁢ brcup ≈ 479.1790202764391 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 0.00208690271836839 times 399 imperial cups.

It can also be expressed as: 399 imperial cups is equal to $\frac{1}{\mathrm{0.00208690271836839}}$ US customary cups.

Approximation

An approximate numerical result would be: three hundred and ninety-nine imperial cups is about four hundred and seventy-nine point one eight US customary cups, or alternatively, a US customary cup is about zero times three hundred and ninety-nine imperial cups.