BMI (Body Mass Index):

BMI is a measure of body fat based on height and weight. Formula: BMI = weight (kg) / height (m)²

• Underweight: BMI less than 18.5
• Normal weight: BMI 18.5-24.9
• Overweight: BMI 25-29.9
• Obese: BMI 30 or greater

Mifflin St Jeor Equation:

Considered one of the most accurate methods for calculating Basal Metabolic Rate (BMR). Developed in 1990 and widely used by nutritionists and fitness professionals.

• Men: BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age in years)
• Women: BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age in years)

Activity Multipliers:

• Sedentary: BMR × 1.2
• Lightly Active: BMR × 1.375
• Moderately Active: BMR × 1.55
• Very Active: BMR × 1.725
• Extra Active: BMR × 1.9

Note: These calculators provide estimates based on population averages. Individual metabolic rates can vary. Consult with a healthcare professional for personalized advice.