Browser-based health calculators — calculate BMI, body fat percentage, BMR, TDEE, and ideal weight using 4 formulas. Includes WHO Asia-Pacific cutoffs specifically relevant for Indian and South Asian populations. All calculations happen locally — no health data is uploaded or stored.
Calculate your Body Mass Index along with body fat percentage (Deurenberg formula), Basal Metabolic Rate (BMR), Total Daily Energy Expenditure (TDEE), and ideal weight using four different formulas. Includes both standard WHO categories and WHO Asia-Pacific cutoffs — providing the lower BMI thresholds that are more clinically relevant for Indian and South Asian populations. Enter height and weight in metric or imperial units.
| Category | Standard WHO (BMI) | Asia-Pacific (BMI) |
|---|---|---|
| Underweight | < 18.5 | < 18.5 |
| Normal weight | 18.5 – 24.9 | 18.5 – 22.9 |
| Overweight | 25 – 29.9 | 23 – 27.4 |
| Obese Class I | 30 – 34.9 | 27.5 – 32.4 |
| Obese Class II | 35 – 39.9 | 32.5 – 37.4 |
| Obese Class III | ≥ 40 | ≥ 37.5 |
Asia-Pacific cutoffs are recommended by the WHO for South Asian, East Asian, and Southeast Asian populations including Indian adults.
BMI (Body Mass Index) is a numerical value calculated from a person's weight and height: BMI = weight(kg) / height(m)². It is used as a screening tool to categorise weight status. A BMI under 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30+ is obese according to standard WHO categories.
The WHO Asia-Pacific guidelines (2004) recommend lower BMI thresholds for Asian populations, including Indians. Overweight is defined as BMI ≥ 23 (vs 25 in standard WHO), and obese as BMI ≥ 27.5 (vs 30). This is because South Asian populations tend to have higher body fat percentage and cardiovascular risk at lower BMI values compared to European populations. The BMI Calculator shows both standard and Asia-Pacific categories.
BMR (Basal Metabolic Rate) is the number of calories your body needs to maintain basic functions at rest — breathing, circulation, and cell production. TDEE (Total Daily Energy Expenditure) is your BMR multiplied by an activity factor that accounts for exercise and daily movement. TDEE is the calorie intake target for weight maintenance.
The BMI Calculator includes 4 ideal weight formulas: Devine Formula (1974, originally for drug dosing), Robinson Formula (1983), Miller Formula (1983), and Hamwi Formula (1964). These give slightly different results — the calculator shows all four so you can see the range rather than relying on a single number.
BMI is a population-level screening tool, not a precise measure of individual health. It does not account for muscle mass (athletes can be classified overweight), age (older adults naturally carry more fat), sex (women have higher healthy fat percentages than men), or ethnicity (South Asians face health risks at lower BMI). Use BMI alongside other metrics and consult a doctor for clinical decisions.
The BMI Calculator uses the Deurenberg formula to estimate body fat percentage from BMI: body fat % = (1.20 × BMI) + (0.23 × age) − (10.8 × sex) − 5.4, where sex = 1 for male and 0 for female. This is an estimate — precise body fat measurement requires methods like DEXA scan, hydrostatic weighing, or calipers.
Under standard WHO guidelines, a healthy BMI is 18.5–24.9. Under WHO Asia-Pacific guidelines recommended for South Asian populations (including Indians), the healthy range is 18.5–22.9, with overweight starting at 23 and obesity at 27.5. The BMI Calculator shows both ranges so Indian users can see where they fall under the more relevant Asia-Pacific cutoffs.
Use: Sedentary (desk job, little exercise), Lightly Active (light exercise 1–3 days/week), Moderately Active (moderate exercise 3–5 days/week), Very Active (hard exercise 6–7 days/week), or Extra Active (very hard exercise + physical job). Most people with office jobs who exercise 3 times per week are Moderately Active.
A calorie deficit of 500 calories per day from your TDEE leads to approximately 0.5 kg (1 lb) of weight loss per week. Subtract 500 from your TDEE to get a safe fat-loss calorie target. Avoid going below 1,200 calories (women) or 1,500 calories (men) without medical supervision.
No. The BMI Calculator runs entirely in your browser. Your height, weight, age, and other health data are never sent to any server or stored anywhere. All calculations happen locally on your device.
Using standard WHO categories: overweight is BMI 25–29.9 and obese is BMI 30 or above. Obesity is further divided into Class I (30–34.9), Class II (35–39.9), and Class III/morbid obesity (40+). Under WHO Asia-Pacific guidelines, overweight is BMI 23–27.4 and obese is BMI 27.5+.
Yes. All health and fitness tools on DDaverse are completely free with no account, no subscription, and no usage limits. Every calculation runs in your browser instantly.
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