There really isn't a specific answer to this. Everyone's metabolism is a little different. www.choosemyplate.gov suggests about 2200 calories per day for Boys ages 14 - 18 who get less than 30 minutes of physical activity each day. If you're more active, then you need to take in more calories. Overall, though, this is just a general guideline, and it really depends on how your body's metabolism works.
U have to find your macros. A 14 yr old burns more calories than an adult. So if you eat 2000 calories a day, the to loose weight, eat 1800-1900. Check out the hodge twins on YouTube. They are under "twin muscle workout"