In present investigation researcher has studied the current levels of high school student’s physical activity, calorie intake and screen time. There is a necessity for information about the associations among adolescents physical activity, calorie intake and screen time. Therefore, the objective of this study is to examine the current levels of physical activity, calorie intake and screen time of high school students from Kannur City. Researcher collected data through children’s self-reported sheet and to find out if any correlation exists among the variables. In this study researcher used quantitative and qualitative methods for the data collection. The study included 74 students. Self-reported sheets were used as a tool for the data collection, and the students average time spent for PA was 26 min, 25.5 Sec.and their minimum and maximum was 18 min., 25.7 Sec and 78 minutes respectively and their twenty fifth percentile was 1200 seconds,ie.20 minutes and 75^th percentile was 1729 seconds,ie 28 minutes. Whereas the average calorie intake was 2131 Cal, and the minimum was 1931 Cal. and maximum was 2351Cal, and their 25^th percentile was 2037 cal and 75^th was 4607 cal. Similarly average screen time was 1 hour 12 minutes and minimum was 43 min, 34.3 Sec.and maximum was 1 hour 37min, 51.43 Sec.and whereas 25^th percentile was 4018 seconds,ie.66 minutes and 75^th percentile was 4607 seconds,ie.76 minutes. The result shows that, among high school children’s, lack of physical activity leads to increased sedentary behavior and screen time were relatively higher than physical activity and there is no correlation between Physical activity and Screen time.