BMI Calculator
BMI estimates whether your weight is in a healthy range for your height. It is a population-level screen, not a diagnosis, and can misclassify very muscular people.
Calorie (TDEE) Calculator
Your Total Daily Energy Expenditure is the calories you burn per day; eat near it to maintain, below to lose, above to gain. About 7,700 kcal ≈ 1 kg of body fat.