Where do these numbers come from?

BMI = Weight(kg) / (Height (m))^2

Daily Maintenance Calories from Harris Benedict equation updated by Mifflin and St Jeor:
Calories = BMR (Basal Metabolic Rate - daily calories expended at rest) x Activity Multiplier*
Men: BMR = (10 x weight (kg)) + (6.25 x height (cm)) - (5 x age (years)) + 5
Women: BMR = (10 x weight (kg)) + (6.25 x height (cm)) - (5 x age (years)) - 161
N.B. *Activity Multiplier ranges from 1.2 to 1.9 based on exercise levels and job activity levels

Suggested Daily Calorie Intake depends on goal:
Endurance or Maintenance = 5% either side of maintenance
Fat Loss = 10-25% less than maintenance
Recomposition = 0-10% less than maintenance
Building Muscle = 5-15% more than maintenance

Suggested Protein Intake depends on goal and diet:
Endurance = 1.6-2g per kg current bodyweight
Maintenance = 1-1.4g per kg current bodyweight
Fat Loss = 2g per kg ideal bodyweight
Recomposition = 2-2.6g per kg current bodyweight
Building Muscle = 1.6-2.2g per kg current bodyweight
N.B. Vegetarian diets add an extra 10% to combat lower absorption rates of plant sources
N.B. Vegan diets add an extra 20% to combat lower absorption rates of plant sources

Suggested Protein Intake per meal:
Evenly divides your protein goal by number of meals entered.
N.B. Ideally this value will be between 20-40g every 3-5 hours to maximise protein synthesis

Nutrition Calculator