I just learned that as an endurance athlete, I need to eat 118 grams of protein per day. Looking at my diet journal, I see that I am not getting that much, and will start tracking protein as well as calories. (I have lost 45 pounds tri training, and am working on shedding my last 10!)
I eat 1200 calories per day, which is my basal metabolic rate. Use my calorie needs calculator to figure out your base metabolism. For weight maintenance, I add to that however many calories I burn during my workouts, which I figure out by using http://www.caloriesperhour.com If I want to lose weight, I only had HALF the calories burned during workouts.
Here’s a nifty tool you can use to calculate how much protein you need each day:
http://www.global-fitness.com/at.cgi?a=411472&e=proteincalc_intro.php