409 metric teaspoons in US customary cups

Conversion formula
How to convert 409 metric teaspoons to US customary cups?

We know (by definition) that: $1\mathrm{brteaspoon}\approx 0.0211337641886519\mathrm{uscup}$

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: 409 ⁢ brteaspoon ≈ 8.643709553158626 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 0.115691069193154 times 409 metric teaspoons.

It can also be expressed as: 409 metric teaspoons is equal to $\frac{1}{\mathrm{0.115691069193154}}$ US customary cups.

Approximation

An approximate numerical result would be: four hundred and nine metric teaspoons is about eight point six four US customary cups, or alternatively, a US customary cup is about zero point one two times four hundred and nine metric teaspoons.