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BMI Calculator

BMI tells you whether your weight is healthy for your height. A raised BMI is one of the strongest risk factors for type 2 diabetes — know your number in seconds.

1

Your Details

Please enter your full name.
Please enter a valid 10 digit mobile number.
2

Your Measurements

Please enter an age between 2 and 120.
Please enter a valid height (50–260 cm).
Please enter a valid weight (10–400 kg).
3

Your Result

Your BMI
0.0
—

0
Under
< 18.5 Normal
18.5 – 22.9 Over
23 – 24.9 Obese
≥ 25
Healthy weight range for your height —
Weight to adjust —
WHO (global) classification —
This BMI is assessed against the Asian-Indian cut-offs recommended by the ICMR and the WHO Asia-Pacific guidelines, which are stricter than the global standard because Indians develop diabetes and heart disease at a lower BMI.
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What is BMI?

Body Mass Index (BMI) is a simple screening number that compares your weight to your height. It gives doctors a quick, reliable indication of whether you are underweight, at a healthy weight, overweight or obese — without any lab test.

BMI is calculated with a single formula:

BMI = Weight (kg) ÷ [Height (m)]2

For example, a person weighing 70 kg with a height of 1.70 m has a BMI of 70 ÷ (1.70 × 1.70) = 24.2. Against the Asian-Indian cut-offs that falls in the overweight band, even though the same number would be called “normal” on the global WHO scale.

The same formula is used for children and teenagers, but the result is plotted on age-and-gender specific percentile charts rather than read against the adult bands below.

Why BMI matters in diabetes

  • Excess body fat makes your cells resistant to insulin — the root cause of type 2 diabetes.
  • Indians store more fat around the abdomen at a lower BMI, a pattern known as the Asian-Indian phenotype.
  • Diabetes risk starts climbing from a BMI of 23 in Indians, not 25.
  • Losing even 5–7% of body weight can significantly improve blood sugar control.
  • A raised BMI also increases the risk of high blood pressure, fatty liver, joint pain and heart disease.

BMI Categories & Ranges

India follows stricter BMI cut-offs than the rest of the world. The table below shows both, so you can see exactly where you stand.

Category Asian-Indian BMI (ICMR / WHO Asia-Pacific) Global BMI (WHO) What it means
Underweight Below 18.5 Below 18.5 Possible nutritional deficiency, low muscle mass or an underlying illness.
Normal / Healthy 18.5 – 22.9 18.5 – 24.9 Lowest risk band. Maintain with balanced diet and regular activity.
Overweight 23.0 – 24.9 25.0 – 29.9 Increased risk of pre-diabetes, high BP and cholesterol. Time to act.
Obese 25.0 and above 30.0 and above High risk of type 2 diabetes and heart disease. Medical guidance advised.

Kins Diabetes uses the Asian-Indian cut-offs in this calculator, in line with ICMR guidance for the Indian population.

What BMI does not tell you

BMI is a screening tool, not a diagnosis. It measures total body weight, not body composition, so it has real limitations:

  • Athletes and people with high muscle mass can show a high BMI while carrying very little fat.
  • Older adults may have a normal BMI despite losing muscle and gaining fat.
  • It ignores where fat is stored — belly fat is far more dangerous than fat on the hips or thighs.
  • It is not valid on its own for pregnant or breastfeeding women.
  • For children and teens the number must be read on a growth percentile chart.

That is why our doctors read your BMI alongside your waist circumference, blood sugar, HbA1c and lipid profile before advising treatment.

How to move toward a healthy BMI

  • Aim for gradual loss. Half a kilo a week is safe and far easier to sustain than crash dieting.
  • Fix the plate, not just the portion. Half vegetables, a quarter protein, a quarter whole grains.
  • Move 150 minutes a week. Brisk walking counts. Add two days of strength work to protect muscle.
  • Cut liquid calories. Sweetened tea, soft drinks and packaged juices add up quickly.
  • Sleep 7–8 hours. Poor sleep drives insulin resistance and appetite.
  • Get screened. If your BMI is 23 or above, ask for a fasting blood sugar and HbA1c test.
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Frequently Asked Questions

What is a healthy BMI for Indians?
A BMI between 18.5 and 22.9 is considered healthy for Indians, as recommended by the ICMR. This is lower than the global WHO range of 18.5 to 24.9 because Indians accumulate abdominal fat and develop insulin resistance at a lower body weight.
BMI is your weight in kilograms divided by the square of your height in metres. If you know your height in feet and inches, this calculator converts it for you automatically before applying the formula.
No. A high BMI is a risk factor, not a diagnosis. Diabetes is confirmed only by blood tests such as fasting plasma glucose, post-meal glucose or HbA1c. If your BMI is 23 or above, it is sensible to get these tests done.
The BMI formula and the category ranges are the same for adult men and women. However, women naturally carry a higher proportion of body fat at the same BMI, which is why doctors also look at waist circumference — above 90 cm in men and 80 cm in women signals higher risk in Indians.
Once every three months is enough for most people. If you are actively working on weight loss, tracking your weight weekly and your BMI monthly gives a clearer picture of progress.
The calculator will compute the number, but adult categories do not apply to anyone under 18. A child's BMI must be plotted on age-and-gender specific percentile charts. Please consult our paediatric diabetes team for an accurate assessment.

Disclaimer: This BMI calculator is provided for general information and awareness only. It is not a substitute for professional medical advice, diagnosis or treatment. Always consult a qualified doctor regarding any health concern.

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