Calculate your Body Mass Index in metric or imperial units. See both WHO and Indian ICMR categories, your healthy weight range, and what your BMI means for your health.
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Your Body Mass Index
UnderweightNormalOverweightObese
<18.518.5–22.923–27.4≥27.5
—Min Healthy Weight
—Max Healthy (India)
—Prime BMI Range
—WHO Category
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How to Use This Calculator
1
Choose your unit system
Select Metric (kg and cm) or Imperial (lbs, feet and inches). The calculator handles all unit conversions automatically.
2
Enter your weight and height
Enter your current weight and height. Use your most recent measurements for accuracy — morning measurements before eating are typically most consistent.
3
Read your result
Your BMI score appears with a colour-coded gauge, your WHO category, your Indian ICMR category, and your healthy weight range for your height.
💡Check the Indian ICMR result — it is often different from the WHO category. At BMI 23–24.9, WHO says "Normal" but ICMR says "Overweight" for Indians. This distinction matters for health decisions.
📊 BMI Categories — India vs WHO
Indian ICMR thresholds are lower than WHO
Underweight
< 18.5
Normal (both)
18.5–22.9
⚠️ Overweight (India only)
23–24.9
Overweight (both)
25–27.4
🔴 Obese (India only)
27.5–29.9
Obese (both)
≥ 30
📏 Healthy Waist Circumference
For Indians, waist size is a better metabolic risk indicator than BMI alone
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Men (India)
< 90 cm
(< 35.4 in)
👩
Women (India)
< 80 cm
(< 31.5 in)
👨
Men (WHO)
< 102 cm
(< 40 in)
👩
Women (WHO)
< 88 cm
(< 34.6 in)
Indian thresholds are stricter because South Asians accumulate more visceral (abdominal) fat at lower weights.
BMI stands for Body Mass Index — a simple numerical measure of body size calculated from a person's weight and height. It was developed in the 1830s by Belgian mathematician Adolphe Quetelet and has since become the most widely used screening tool for categorising weight status in adults worldwide.
BMI is used by doctors, hospitals, insurance companies, public health bodies, and fitness professionals because it is quick, free, and requires only two measurements. It correlates reasonably well with body fat percentage at the population level, making it a useful starting point for identifying individuals who may be at risk for weight-related health conditions.
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Clinical Screening
Doctors use BMI to flag patients who may need further tests for diabetes, hypertension, cholesterol, and cardiovascular risk.
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Insurance Purposes
Many Indian life and health insurers use BMI to assess risk and determine premiums. BMI above 30 often attracts higher rates.
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Fitness Tracking
Used alongside waist circumference, body fat %, and fitness tests as one component of a complete body composition assessment.
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Government Health Policy
India's National Family Health Survey (NFHS) and ICMR use BMI data to track obesity trends across states and demographics.
⚠️BMI is a screening tool, not a diagnostic tool. A high BMI indicates possible weight-related risk — it does not diagnose any condition. Always consult a doctor for a complete health assessment.
How BMI is Calculated — Formula and Worked Example
BMI is calculated using a straightforward formula. The same final number is produced regardless of whether you use metric or imperial measurements — only the formula changes slightly.
Metric formula (standard)
BMI Formula — Metric
BMI = Weight (kg) ÷ Height² (m²)
Weight = body weight in kilograms Height² = height in metres, squared (multiplied by itself)
Imperial formula
BMI Formula — Imperial
BMI = (Weight in lbs × 703) ÷ Height² (inches²)
703 = conversion factor to give the same result as metric Height in inches = total height in inches (e.g. 5'7" = 67 inches)
Worked example — common Indian case
Example: Person weighing 75 kg, height 170 cm — what is the BMI and health category?
Indian ICMR category: 23–27.4 = Overweight (both agree here)
BMI = 25.9 — Overweight by both WHO and Indian ICMR standards. Healthy weight range for 170 cm = 53.5–66.2 kg (Indian standard).
Why Indian BMI Standards Are Different from WHO
The WHO global BMI categories (overweight at 25, obese at 30) were developed using data primarily from Western European and North American populations. Multiple studies have shown that South Asians — including Indians — develop metabolic complications at lower BMI values than these populations.
Research published in the Lancet and other journals found that Indians tend to have significantly higher body fat percentage at the same BMI as Europeans. At BMI 22, an Indian may have the same metabolic risk as a European at BMI 26. This is driven by two factors specific to South Asian body composition:
Higher visceral fat: Indians store more fat around the abdominal organs (visceral fat) compared to subcutaneous fat, even at lower BMIs. Visceral fat is metabolically active and strongly linked to type 2 diabetes, heart disease, and insulin resistance.
Lower muscle mass: Indians tend to have lower lean muscle mass relative to body weight compared to Europeans at the same BMI, meaning a larger proportion of body weight is fat.
Based on this evidence, the Indian Council of Medical Research (ICMR) and the WHO Regional Office for the Western Pacific jointly revised the cut-offs for Asian populations. The result is the Indian BMI scale used on this calculator.
Key difference in practice: If your BMI is 23.5, the WHO says you are "Normal weight." The Indian ICMR says you are "Overweight." For Indians making health decisions — about diet, exercise, or medical consultations — the Indian standard is the more appropriate guide.
India's obesity crisis by the numbers
India had approximately 180 million overweight adults and 40 million obese adults as of 2025, according to NFHS-5 data. Urban Indians are disproportionately affected — the prevalence of obesity in urban areas is nearly double that in rural areas. Among urban professionals aged 30–50, overweight and obesity rates (by ICMR standards) are estimated at over 50%.
BMI Categories — India vs WHO Comparison Table
The table below shows both WHO global standards and Indian ICMR standards side by side. For Indians, always use the ICMR column as the reference — the WHO column is provided for comparison with international norms.
BMI Range
WHO Category
Indian ICMR Category
Health Risk Level
Recommended Action
< 16.0
Severely Underweight
Severely Underweight
Very High
Medical attention needed
16.0–18.4
Underweight
Underweight
High
Consult doctor; increase caloric intake
18.5–22.9
Normal Weight
Normal Weight ✅
Low
Maintain current habits
23.0–24.9
Normal Weight
Overweight ⚠️
Moderate (India)
Review diet and activity level
25.0–27.4
Overweight
Overweight
Moderate–High
Diet modification + exercise
27.5–29.9
Overweight
Obese 🔴
High (India)
Medical consultation recommended
30.0–34.9
Obese Class I
Obese
High
Medical supervision required
35.0–39.9
Obese Class II
Severely Obese
Very High
Specialist referral recommended
≥ 40.0
Obese Class III
Morbidly Obese
Extremely High
Immediate medical intervention
⚠️The highlighted rows (BMI 23–24.9 and 27.5–29.9) are where WHO and Indian standards disagree. If you fall in these ranges, you are normal by WHO standards but overweight or obese by Indian ICMR standards. Always use the Indian standard for health decisions in India.
Ideal Weight for Indians by Height
The ideal weight range for Indians corresponds to a BMI of 18.5–22.9 (ICMR standard). The table below gives the exact healthy weight range for common heights in India — both in centimetres and feet/inches.
Height
Min Healthy Weight
Max Healthy Weight (India)
Max Healthy Weight (WHO)
BMI Range Used
150 cm (4'11")
41.6 kg
51.6 kg
56.0 kg
18.5–22.9 / 24.9
155 cm (5'1")
44.4 kg
55.0 kg
59.8 kg
18.5–22.9 / 24.9
160 cm (5'3")
47.4 kg
58.6 kg
63.7 kg
18.5–22.9 / 24.9
165 cm (5'5")
50.3 kg
62.3 kg
67.7 kg
18.5–22.9 / 24.9
170 cm (5'7")
53.5 kg
66.2 kg
71.9 kg
18.5–22.9 / 24.9
175 cm (5'9")
56.6 kg
70.1 kg
76.2 kg
18.5–22.9 / 24.9
180 cm (5'11")
59.9 kg
74.2 kg
80.6 kg
18.5–22.9 / 24.9
185 cm (6'1")
63.3 kg
78.5 kg
85.3 kg
18.5–22.9 / 24.9
190 cm (6'3")
66.8 kg
82.7 kg
89.9 kg
18.5–22.9 / 24.9
These values are calculated using the ICMR-recommended upper BMI of 22.9 for Indians. Use the calculator above to get the exact healthy weight range for any specific height.
5 Common BMI Mistakes and Misconceptions
BMI is simple enough to calculate but widely misunderstood — both in what it means and how to interpret it. These are the most common errors people make.
Mistake 1 — Using WHO categories instead of Indian ICMR categories
✗ Wrong: BMI 24 is normal, so I am healthy — I checked the WHO chart
✓ Right: BMI 24 is overweight by Indian ICMR standards — threshold is 23, not 25
This is the most consequential mistake Indians make with BMI. A BMI of 23–24.9 is "Normal" by WHO global standards but "Overweight" by Indian ICMR standards. For South Asians, the higher metabolic risk at these BMI levels means the ICMR standard is clinically more relevant. This calculator shows both — always use the Indian result for health decisions in India.
Mistake 2 — Treating BMI as the only measure of health
✗ Wrong: My BMI is 22 so I am completely healthy — nothing to worry about
✓ Right: BMI 22 is good, but waist circumference, blood sugar, cholesterol, and blood pressure matter equally
BMI is a population screening tool, not a complete health assessment. A person with BMI 22 can still have high blood sugar, high cholesterol, or dangerous visceral fat — especially if they are sedentary. For Indians, waist circumference (below 90 cm for men, below 80 cm for women) is an equally important metric. BMI is one input, not the whole picture.
Mistake 3 — Not accounting for muscle mass
✗ Wrong: My BMI is 27, so I must lose weight
✓ Right: If you are highly muscular with low body fat, BMI 27 may not indicate excess fat
BMI cannot distinguish between fat mass and muscle mass. A person with significant muscle development — athletes, gym-goers, manual labourers — may have a high BMI while having low body fat. The formula just divides weight by height squared, and dense muscle weighs more than fat. In these cases, body fat percentage measurement (DEXA scan, calipers, or bio-impedance) is more informative than BMI.
Mistake 4 — Using BMI for children using adult categories
✗ Wrong: My 12-year-old has BMI 22 — that's normal for an adult so they're fine
✓ Right: Children use age- and gender-specific BMI-for-age percentile charts, not adult categories
Adult BMI categories do not apply to children and adolescents. For anyone under 18, BMI-for-age percentile charts must be used — the healthy range varies by age and gender. A BMI that is "normal" for a 35-year-old may indicate overweight or underweight in a 10-year-old. Always consult your paediatrician for children's weight assessments.
Mistake 5 — Ignoring abdominal fat in favour of BMI alone
✗ Wrong: I am not obese by BMI, so I do not need to worry about belly fat
✓ Right: Abdominal obesity (waist > 90 cm for men, > 80 cm for women) is dangerous even at normal BMI
Research consistently shows that abdominal (visceral) fat is more strongly linked to type 2 diabetes, heart disease, and metabolic syndrome than overall BMI. A person with BMI 22 but a waist of 95 cm is at higher metabolic risk than someone with BMI 26 and a waist of 82 cm. For Indians especially, waist circumference is a critical health measure that BMI cannot replace.
⚕️ Calculate Your BMI — Indian ICMR Standard
Use the free BMI calculator above to see your WHO and Indian ICMR categories, your healthy weight range, and your gauge position — in metric or imperial.
According to Indian ICMR guidelines, a normal BMI for Indians is between 18.5 and 22.9. This is lower than the WHO global standard (18.5–24.9) because research shows South Asians have higher body fat percentage and greater metabolic risk at the same BMI as Europeans. A BMI of 23–27.4 is considered overweight, and 27.5 and above is obese by Indian standards.
BMI is calculated by dividing your weight in kilograms by the square of your height in metres. Formula: BMI = weight (kg) ÷ height² (m²). For example, if you weigh 70 kg and are 1.75 m tall: BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.0625 = 22.9, which is normal by both WHO and Indian ICMR standards. In imperial units, the formula is BMI = (weight in lbs × 703) ÷ height in inches².
Standard WHO BMI categories were developed using primarily Western populations. Research consistently shows that South Asians including Indians develop metabolic complications — diabetes, heart disease, high blood pressure — at lower BMI values than Europeans. The ICMR therefore recommends lower thresholds: overweight starts at BMI 23 (not 25) and obese at BMI 27.5 (not 30) for Indians. This calculator shows both standards so you can see where you fall on each scale.
Ideal weight for Indians corresponds to a BMI of 18.5–22.9 (ICMR standard). For 170 cm height, the healthy weight range is 53.5–66.2 kg. For 160 cm, it is 47.4–58.6 kg. For 175 cm, it is 56.6–70.1 kg. Use the calculator above — enter your height and any weight to get the exact healthy weight range for your specific height in your preferred units.
Yes, significantly. BMI does not distinguish between muscle and fat — a highly muscular person may have a high BMI but low body fat and excellent metabolic health. It also does not account for age, gender, or where body fat is stored. Abdominal fat (measured by waist circumference) is actually a better predictor of metabolic risk for Indians than BMI. Always treat BMI as one screening data point, not a complete health assessment. Consult a doctor for a thorough evaluation.
5 feet 7 inches = 170.18 cm = 1.7018 m. BMI = 70 ÷ (1.7018)² = 70 ÷ 2.896 = 24.2. By WHO standards, this is "Normal weight" (range 18.5–24.9). By Indian ICMR standards, this is "Overweight" (threshold is 23.0). This is one of the clearest examples of how the WHO and Indian standards differ in the BMI 23–24.9 range — and why Indians should use the ICMR standard for health decisions.
For Indians, a healthy waist circumference is below 90 cm (35.4 inches) for men and below 80 cm (31.5 inches) for women. These thresholds are considerably lower than WHO global guidelines (102 cm for men, 88 cm for women) because South Asians accumulate more visceral (abdominal) fat at smaller waist sizes. Abdominal fat is the most metabolically dangerous type of fat, strongly linked to type 2 diabetes, insulin resistance, and heart disease. Measure your waist at the level of your navel for the most accurate reading.
BMI gives the same numerical result regardless of whether you use metric or imperial units — the number itself is unit-free. In metric: BMI = weight (kg) ÷ height² (m²). In imperial: BMI = (weight in lbs × 703) ÷ height in inches². Both formulas produce the same result. Use the calculator above — select your preferred unit system (Metric or Imperial) and it handles all conversion automatically. No manual calculation needed.