BMI & Calorie Calculator
Calculate your Body Mass Index and daily calorie needs. Uses the Mifflin-St Jeor formula for accurate TDEE estimates with activity level, goal and macro breakdown.
Healthy weight range for your height: 56.7–76.3 kg
BMI Categories
Underweight
< 18.5
Normal weight
18.5 – 24.9
Overweight
25 – 29.9
Obese
≥ 30
About BMI & Calorie Calculator
Calculate your Body Mass Index and daily calorie needs instantly. The BMI tab shows your BMI score, category and healthy weight range for your height. The Calorie tab uses the Mifflin-St Jeor formula to estimate your TDEE based on activity level and breaks down maintenance, weight-loss and weight-gain targets — plus suggested macro ratios for protein, carbs and fat.
Use Cases
- →Check if your current weight falls within a healthy BMI range
- →Calculate how many calories you need to lose, maintain, or gain weight
- →Get a starting point for your daily protein, carb and fat targets
Tips
- ✓BMI is a screening tool — it does not account for muscle mass or body composition
- ✓Use the Calorie tab to get your TDEE based on your actual activity level
- ✓Macro targets are general guidelines — adjust based on your specific diet plan
Frequently Asked Questions
BMI (Body Mass Index) is calculated by dividing your weight in kilograms by the square of your height in meters. In imperial, the formula is: BMI = 703 × weight(lb) / height(in)². The result categorizes body weight as underweight (<18.5), normal (18.5–24.9), overweight (25–29.9) or obese (≥30).
TDEE (Total Daily Energy Expenditure) is calculated using the Mifflin-St Jeor formula for Basal Metabolic Rate — the calories your body needs at rest — multiplied by an activity factor. Men: BMR = 10×weight + 6.25×height − 5×age + 5. Women: BMR = 10×weight + 6.25×height − 5×age − 161.
BMI is a useful screening tool but has limitations — it does not distinguish between muscle and fat mass. Highly muscular people may have a high BMI without excess body fat. For a complete picture, consult a healthcare professional.
The weight-loss target subtracts 500 kcal/day from your TDEE. A deficit of 500 kcal/day is generally associated with losing approximately 0.5 kg (1 lb) per week. The calculator enforces a minimum of 1,200 kcal/day.
The suggested macros use a general 30% protein / 40% carbs / 30% fat distribution applied to your daily calorie goal. These are guidelines — optimal ratios vary based on your training style, diet preference and individual metabolism.
Yes. Toggle between Metric (kg / cm) and Imperial (lb / ft + in) at any time. Values are converted automatically when you switch so you never have to re-enter your data.