Depends on the size of the cup! But generally a half a cup of white rice will contain around 103 calories and half a cup of brown rice will contain around 108 calories. I don't know if cooking rice will change the number of calories and the best thing you can do is to consult a good dietician. If you are on a diet, then it is better to avoid eating rice altogether and stick to wheat based products. The number of calories can also differ according to the grain of the rice. Long grain rice would contain more calories than the short grain version.