The ounce (oz) is an imperial unit of weight equal to about 28.35 grams, widely used in the United States for food packaging, postal services, and precious metals. In the kitchen, recipes often list ingredients in ounces, and gold and silver are traded in troy ounces. One ounce equals approximately 28.35 grams.

The pound (lb) is an imperial unit of mass equal to exactly 0.45359237 kilograms, serving as the primary weight unit in the United States and parts of the British Commonwealth. Body weight, gym equipment, and packaged goods in America are almost always labeled in pounds. One pound equals 16 ounces or roughly 0.4536 kilograms.