I am interested in how much a standard teenager should be eating every day. I have measured my BMR on a Tanita machine to be 1550 calories/day ; however there are many differences in the predictive PALs factors on one's BMR.
Some websites, for examply state 1.4 is the standard for a sedentary lifestyle.
However, many others suggest a PAL of 1.55+ for a sendentary lifestyle.
This is around a 200 calorie difference, which can determine weight gain/loss.
Thread: Variancies in PAL and TEE