21 centiliters in US customary cups

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

We know (by definition) that: $1\mathrm{centiliter}\approx 0.0422675283773037\mathrm{uscup}$

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 ⁢ centiliter ≈ 0.8876180959233777 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 1.12661065 times 21 centiliters.

It can also be expressed as: 21 centiliters is equal to $\frac{1}{\mathrm{1.12661065}}$ US customary cups.

Approximation

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