639 milliliters in US customary cups

Conversion formula
How to convert 639 milliliters to US customary cups?

We know (by definition) that: $1\mathrm{ml}\approx 0.00422675283773037\mathrm{uscup}$

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: 639 ⁢ ml ≈ 2.7008950633097064 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 0.370247631455399 times 639 milliliters.

It can also be expressed as: 639 milliliters is equal to $\frac{1}{\mathrm{0.370247631455399}}$ US customary cups.

Approximation

An approximate numerical result would be: six hundred and thirty-nine milliliters is about two point seven zero US customary cups, or alternatively, a US customary cup is about zero point three seven times six hundred and thirty-nine milliliters.