BMI Calculator India
Body mass index (BMI) is a measure of body fat based on height and weight. Enter your details to see your BMI score and health category — including the adjusted South Asian cut-offs recommended for Indians.
Height
Weight
What is BMI?
Body Mass Index (BMI) is a numerical value derived from a person's weight and height. It provides a simple, low-cost screening tool to categorise individuals into weight status groups — underweight, normal, overweight, and obese. BMI was developed by Belgian mathematician Adolphe Quetelet in the 19th century and has since become one of the most widely used health indicators by doctors, researchers, and public health organisations worldwide.
The formula is straightforward:
In imperial units: BMI = (Weight in lbs / Height in inches²) × 703. Our calculator handles both unit systems automatically.
How to use this BMI calculator
- Select your unit system: Choose metric (kg, cm) or imperial (lbs, ft/in).
- Enter your height: Use the slider or type your height directly.
- Enter your weight: Enter your current weight in the selected unit.
- Your BMI score and health category are displayed instantly.
BMI categories
| BMI Range | Category | Health Implication |
|---|---|---|
| Below 18.5 | Underweight | May indicate nutritional deficiency, increased risk of bone loss |
| 18.5 – 24.9 | Normal weight | Associated with the lowest risk of weight-related disease |
| 25.0 – 29.9 | Overweight | Elevated risk of cardiovascular disease, type 2 diabetes |
| 30.0 – 34.9 | Obese (Class I) | High risk; lifestyle intervention typically recommended |
| 35.0 – 39.9 | Obese (Class II) | Very high risk; medical assessment advisable |
| 40 and above | Obese (Class III) | Extremely high risk; clinical management recommended |
Healthy BMI for Indians — Adjusted Cut-offs
The standard WHO BMI thresholds were developed largely based on Western populations. Research shows that South Asians — including Indians — develop obesity-related health risks at lower BMI values. The WHO Expert Consultation and Indian Council of Medical Research (ICMR) recommend these adjusted thresholds for Indians:
| BMI Range (India) | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 22.9 | Normal weight |
| 23.0 – 27.4 | Overweight (elevated risk) |
| 27.5 and above | Obese (high risk) |
These cut-offs are advisory — consult your doctor for personalised guidance.
What you can do to improve your health
- Aim for at least 150 minutes of moderate-intensity aerobic activity each week.
- Choose a balanced diet rich in vegetables, whole grains, and lean protein.
- Limit added sugars, saturated fats, and ultra-processed foods.
- Get 7–9 hours of quality sleep per night — sleep affects weight regulation and metabolism.
- Track progress over months, not days — sustainable habits matter more than short-term results.
Limitations of BMI
BMI is a useful population-level screening tool, but it has important limitations when applied to individuals:
- Does not measure body fat directly. Two people with the same BMI can have very different body compositions — one may be muscular, the other may carry excess fat.
- Athletes may be misclassified. High muscle mass increases weight, pushing BMI into the overweight or obese range despite low body fat percentage.
- Age and sex differences. Older adults typically have more body fat than younger adults at the same BMI. Women generally carry more fat than men at equivalent BMI values.
- Ethnic variation. South Asians, including Indians, tend to carry metabolic risk at lower BMI thresholds. Some health organisations recommend an adjusted cut-off of 23 for overweight in South Asian populations.
- For a complete assessment, doctors use BMI alongside waist circumference, body fat percentage, blood pressure, and blood test results.
Understanding your BMI result
- A BMI above 25 is associated with increased risk of type 2 diabetes, heart disease, and certain cancers — but it is not a diagnosis.
- Athletes and highly muscular individuals often show an elevated BMI despite low body fat — consider waist circumference as an additional measure.
- Adults over 65 may benefit from a slightly higher BMI (up to 27) as protection against falls and bone loss.
- For personalised guidance, consult a doctor or registered dietitian rather than relying solely on a single number.
Related Calculators
BMI thresholds on this page follow the guidelines published by the National Heart, Lung, and Blood Institute (NHLBI). This tool is for informational purposes only and does not constitute medical advice.