21 US gallons in US customary teaspoons

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

We know (by definition) that: $1\mathrm{usgallon}\approx 768\mathrm{usteaspoon}$

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 ⁢ usgallon ≈ 16128 ⁢ usteaspoon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary teaspoon is equal to 6.20039682539683e-05 times 21 US gallons.

It can also be expressed as: 21 US gallons is equal to $\frac{1}{\mathrm{6.20039682539683e-05}}$ US customary teaspoons.

Approximation

An approximate numerical result would be: twenty-one US gallons is about sixteen thousand, one hundred and twenty-eight US customary teaspoons, or alternatively, a US customary teaspoon is about zero times twenty-one US gallons.