There are 250 calories in 1 cup of cooked rice. However, there are only 70 calories in ⅔ cup of uncooked rice. For an average diet, consuming carbs that have been mostly processed and white is far better than eating the exact same amount as brown whole grain carbs.
It’s important to keep in mind that the number of calories is not specific to just one type of food or another- it’s how many equivalent cups do you need to eat for your given calorie requirement? White rice will be much simpler on your digestive tract because it doesn’t require breakdown like whole foods, and thus has fewer fermenting issues during digestion through a greater diversity of bacteria etc.