Age: This field requires your current age in years. It is a crucial factor in determining your Basal Metabolic Rate (BMR), as metabolism naturally changes as we get older.

Gender: This field requires you to select your gender, either male or female. Biological differences in body composition and metabolism mean that males typically have a higher BMR than females of the same age, height, and weight.

Activity Level: This field asks you to select how active you are on a weekly basis. This helps to determine your Total Daily Energy Expenditure (TDEE) by multiplying your BMR by an activity factor.

Height: This field requires you to input your height, typically in feet and inches or centimeters. Along with age and weight, height is a key variable used in various formulas (e.g., Mifflin-St Jeor equation) to calculate your BMR.

Weight: This field requires your current body weight, typically in pounds or kilograms. Your weight is a direct component of the BMR calculation and is also the starting point for setting your calorie and macro goals.

Macro Ratio: This field allows you to customize the percentage split of your three macronutrients: protein, carbohydrates, and fats. The total of these percentages should always equal 100%. This ratio can be adjusted based on your personal preferences, dietary needs, and specific goals (e.g., a higher protein ratio for muscle building or a lower carb ratio for a ketogenic diet).