it takes about 15 calories per pound of ideal body weight to maintain your ideal weight. i don't know how tall you are or your sex so i can't calculate your "ideal weight" but you should not have any problems doing that calculation. it is not just calories that matter. you should be on a balanced diet with sufficient protein carbohydrates and yes. even fat. if you are only eating 1400 calories a day this amount does not seem to be sufficient. i suspect you will lose weight over time eating this much especially if you are working out. take a nutrition class.
i am 16 and 118 pounds. i work out 15-20 times per week. how many calories should i be eating? . i now eat 1 400