One pound equals 16 ounces, to convert 21 pounds to ounces we have to multiply the amount of pounds by 16 to obtain the amount in ounces. 21 pounds is equal to 21 x 16 = 336 ounces.
One pound (lb), the international avoirdupois pound, is legally defined as exactly 0.45359237 kilograms.
One ounce (oz) equals to one sixteenth of a pound avoirdupois. The avoirdupois ounce equal to approximately 28.3 grams and the troy ounce of about 31.1 grams. The ounce is a unit of weight used in most British derived customary systems of measurement.
To calculate a pound value to the corresponding value in ounces, just multiply the quantity in ounces by 16 (the conversion factor).
Ounces = Pounds * 16
The factor 16 is the result from the division 1 / 0.0625 (ounce definition). Therefore, another way would be:
Ounces = Pounds / 0.0625
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