21 metric teaspoons in US customary teaspoons

Conversion formula
How to convert 21 metric teaspoons to US customary teaspoons?

We know (by definition) that: $1\mathrm{brteaspoon}\approx 1.01442068105529\mathrm{usteaspoon}$

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

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

Conclusion: 21 ⁢ brteaspoon ≈ 21.30283430216109 ⁢ usteaspoon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary teaspoon is equal to 0.0469421104166667 times 21 metric teaspoons.

It can also be expressed as: 21 metric teaspoons is equal to $\frac{1}{\mathrm{0.0469421104166667}}$ US customary teaspoons.

Approximation

An approximate numerical result would be: twenty-one metric teaspoons is about twenty-one point three zero US customary teaspoons, or alternatively, a US customary teaspoon is about zero point zero five times twenty-one metric teaspoons.