Each pound contains exactly 16 ounces. Any number of pounds can be converted to ounces by multiplying it by 16. Similarly, a number of ounces can be converted to pounds by dividing by 16.
Both ounces and pounds are units of weight in the imperial metric system. They are most closely comparable to grams and kilograms in the metric system. There are approximately 28 grams in a single ounce, which is equal to 0.028 kilograms. Note that there are 16 U.S. ounces in 1 U.S. pound. Different countries had different sized ounces and pounds in the past when they used the imperial system.