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 stone (st) is a British imperial unit equal to 14 pounds or about 6.35 kilograms, traditionally used in the United Kingdom and Ireland for body weight. When someone in the UK says they weigh 11 stone, they mean 154 pounds, a convention that persists in everyday conversation and medical records. One stone equals exactly 6.35029 kilograms.