In reply to Jamie.

You can never really know exactly how much you're eating. Even packages' nutrition labels are based on a sample. These numbers will vary based on what brand of ingredients you use, how well you weigh your food and how you prepare it. Take these numbers as guidelines and use well known and reputable apps like MyFitnessPal to calculate your macros as well as you possibly can. Being as close to accurate is better than simply guessing. Hope that helps!