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Health Calculators

BMI, calorie needs and ideal weight — in one place

Most people know their weight. Very few know what that weight actually means for their health — and fewer still know how many calories they actually burn in a day. Those two numbers, BMI and TDEE, are the foundation of every diet and fitness plan that works. Our BMI & Calorie Calculator gives you both in one place.

Body Mass Index (BMI) is calculated from your height and weight: BMI = Weight (kg) ÷ Height (m)². The WHO classification ranges from Underweight (<18.5) to Obese Class III (≥40). While BMI doesn't measure body fat directly, it is the standard screening tool used by doctors, insurance companies, and fitness professionals globally.

More useful than BMI alone is your Total Daily Energy Expenditure (TDEE) — the number of calories you actually burn per day based on your height, weight, age, gender and activity level. The calculator uses the Harris-Benedict formula to compute Basal Metabolic Rate (BMR) first, then multiplies by an activity factor. TDEE is the number you should eat at to maintain your current weight. To lose 0.5 kg/week, eat at a 500 kcal/day deficit. To gain muscle, eat at a 300–500 kcal/day surplus.

The ideal weight range shows the weight range at which your BMI falls within the "Normal" category (18.5–24.9) for your height. This is a useful goal-setting anchor when starting a fitness journey.

All inputs are accepted in both metric (kg/cm) and imperial (lbs/ft) units.

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BMI & Calorie Calculator

Calculate your Body Mass Index, daily calorie needs (TDEE) and ideal weight range using the Harris-Benedict formula.

Frequently Asked Questions

Is BMI an accurate measure of health?
BMI is a useful population-level screening tool but has limitations for individuals. It doesn't distinguish between muscle and fat (athletes can have "overweight" BMI despite low body fat). For most adults, BMI combined with waist circumference and TDEE gives a much clearer health picture. Use BMI as a starting point, not the final word.
How many calories should I eat to lose weight?
Start with your TDEE from the calculator. To lose 0.5 kg/week, subtract 500 kcal/day from your TDEE. To lose 1 kg/week, subtract 1,000 kcal/day (this is the maximum recommended safe deficit). Going below 1,200 kcal/day for women or 1,500 kcal/day for men is not recommended without medical supervision.
What is a healthy BMI range for Indians?
The WHO BMI scale uses 18.5–24.9 as "Normal" for all ethnicities. However, some studies suggest South Asians face higher metabolic risk at lower BMI values — some Indian health bodies recommend 18.5–22.9 as the optimal range for Indians. Our calculator shows both WHO classification and your numeric BMI.