A peanut weighs approximately 0.09 ounce. There are 126 calories in 1 ounce of peanuts and 11 calories per peanut. Dividing 11 calories per peanut by 126 calories per ounce gives the number of ounces per peanut.
A peanut contains 0.94 gram of fat, 0.27 gram of carbohydrates and 0.5 gram of protein. Peanuts are high in monounsaturated fats, which are healthy for the heart. Peanuts can also help prevent gallstones, protect against Alzheimer's disease and reduce the risk of weight gain. Peanuts have existed for thousands of years and originated in South America. They were introduced to North America during the beginning of the slave trade.