How many calories would I have lost if?

I am 14 weigh 123 and am 5'6, male, but I feel like I have been gaining weight because I have been eating quite a bit of fatty foods. Anyway in school we had the pacer so I felt like actually trying this time and I got 80 which is my highest how many calories would I have burned? Or if I ran 10 laps around the average track in school how many calories would that be lost?