How do calorie and macro targets work?

Open Settings > Nutrition targets, pick a goal (lose, maintain or gain) and how active you are. Trailwise suggests a daily calorie target from your profile (your latest weight, height, age and sex) using the Mifflin-St Jeor equation, then splits it into protein, carbs and fat. Protein is anchored to your body weight (about 1.8 g per kg) to protect lean mass, fat is set at roughly a quarter of your energy, and carbs take the rest.

Every number stays editable, so the suggestion is a starting point, not a rule. Once set, the Nutrition page shows each day as "X of Y" with what is left to eat. If your profile is missing a weight, height or date of birth, the form says so rather than guessing.