The size of medals can vary depending on the organization or event that is awarding them. However, in general, medals tend to be around 2-3 inches (5-7.5 cm) in diameter and can weigh anywhere from a few ounces to over a pound. The size and weight of a medal can also depend on the significance of the award and the materials used to make it. For example, Olympic medals are approximately 85mm in diameter and weigh between 500-600 grams.