One ounce equals 0.0625 pounds, to convert 640 ounces to pounds we have to multiply the amount of ounces by 0.0625 to obtain amount in pounds. 640 ounces is equal to 640 / 0.0625 = 40 pounds.
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.
One pound (lb), the international avoirdupois pound, is legally defined as exactly 0.45359237 kilograms.
To calculate an ounce value to the corresponding value in pounds, just multiply the quantity in ounces by 0.0625 (the conversion factor).
Pounds = Ounces * 0.0625
The factor 0.0625 is the result from the division 1 / 16 (ounce definition). Therefore, another way would be:
Pounds = Ounces / 16
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