With this information, you can calculate the quantity of ounces 21 pounds is equal to.

¿What is the inverse calculation between 1 ounce and 21 pounds?

Performing the inverse calculation of the relationship between units, we obtain that 1 ounce is 0.0029761905 times 21 pounds.

Which is the same to say that 21 pounds is 336 ounces.

Twenty-one pounds equals to three hundred thirty-six ounces. *Approximation

A ounce is zero times twenty-one pounds. *Approximation