21 US customary teaspoons in US gallons

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

We know (by definition) that: $1\mathrm{usteaspoon}\approx 0.00130208333333333\mathrm{usgallon}$

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

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

Conclusion: 21 ⁢ usteaspoon ≈ 0.02734374999999993 ⁢ usgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US gallon is equal to 36.5714285714286 times 21 US customary teaspoons.

It can also be expressed as: 21 US customary teaspoons is equal to $\frac{1}{\mathrm{36.5714285714286}}$ US gallons.

Approximation

An approximate numerical result would be: twenty-one US customary teaspoons is about zero point zero three US gallons, or alternatively, a US gallon is about thirty-six point five seven times twenty-one US customary teaspoons.