Gaining muscle mass

fudokung

I am a 19year old boarding school boy. My weight right now is 64kg and my height is 174cm. I want to gain some muscle mass, maybe around 0.2lbs a week. Does this mean I need to have a bigger amount of calorie intake? Say I used to eat around 1800 calories a day for the last two months what kind of daily calorie should I be aiming for now if I want to gain some muscle mass through strength training.