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BMI Calculator

Check your BMI, healthy weight range, ideal weight, body fat estimate, daily calories and a goal plan. Works in kg/cm and lb/ft, with the Asian (India) standard. Nothing leaves your device

1 About you
BMI for under 18 needs growth charts, so extras are shown for adults only.
2 Your measurements
Adds a waist-to-height check, which shows belly fat risk that BMI misses.
3 BMI standard
4 Goal and activity optional
After the first result, numbers update live as you type.
Result
WAITING
Enter your height and weight, then press Calculate.
Progress history
No registration Private, runs in your browser Asian BMI standard Track progress
BMI categories
  • WHO global: under 18.5 underweight, 18.5 to 24.9 healthy, 25 to 29.9 overweight, 30 and above obese
  • Asian (India): under 18.5 underweight, 18.5 to 22.9 healthy, 23 to 24.9 overweight, 25 and above obese (Indian consensus guidelines). WHO kept its global cut-offs in 2004 but marked 23 as a public health action point, because diabetes and heart risk rise at a lower BMI in Asian populations
  • Formula: weight in kg divided by height in metres squared
How the extra numbers work
  • Healthy range: the weights that give a BMI inside the healthy band for your height and chosen standard
  • BMI Prime: your BMI divided by the overweight cut-off. Below 1.0 means under the cut-off
  • Ideal weight: Devine formula (adults, needs sex). It is an old clinical reference, so treat the healthy range as your main target
  • Body fat: estimated from BMI, age and sex (Deurenberg formula). It can be off by 4 to 5 percentage points. It is not a body scan
  • Calories: BMR from the Mifflin-St Jeor equation, multiplied by your activity level. A change of about 7,700 kcal is a common rule of thumb for 1 kg of body weight, so 0.5 kg a week is roughly 550 kcal a day. Real results vary
  • Safety floor: calorie targets are not shown below 1,200 kcal (women) or 1,500 kcal (men)
Limits of BMI
  • BMI does not separate muscle from fat. Athletes and gym-goers can show as overweight
  • It is not valid during pregnancy, and for children and teens it must be read on age and sex percentile charts
  • Older adults may be healthier at a slightly higher BMI
  • Waist-to-height ratio below 0.5 is a simple extra check for belly fat
  • This tool is for information only. Talk to a doctor or dietitian before changing your diet
Sources
  • World Health Organization. Obesity: preventing and managing the global epidemic. WHO Technical Report Series 894, 2000. (Global BMI categories)
  • WHO Expert Consultation. Appropriate body-mass index for Asian populations and its implications for policy and intervention strategies. The Lancet 2004;363(9403):157-163. PubMed
  • Misra A, et al. Consensus statement for diagnosis of obesity, abdominal obesity and the metabolic syndrome for Asian Indians. J Assoc Physicians India 2009;57:163-170. PubMed
  • Misra A, et al. Revised definition of obesity in Asian Indians living in India. Diabetes & Metabolic Syndrome 2025;19:102989. DOI
  • Ashwell M, Gunn P, Gibson S. Waist-to-height ratio is a better screening tool than waist circumference and BMI for adult cardiometabolic risk factors. Obesity Reviews 2012;13(3):275-286.
  • Gibson S, Ashwell M. A simple cut-off for waist-to-height ratio (0.5) can act as an indicator for cardiometabolic risk. British Journal of Nutrition 2020;123(6):681-690.
  • Mifflin MD, et al. A new predictive equation for resting energy expenditure in healthy individuals. American Journal of Clinical Nutrition 1990;51(2):241-247.
  • Deurenberg P, Weststrate JA, Seidell JC. Body mass index as a measure of body fatness: age- and sex-specific prediction formulas. British Journal of Nutrition 1991;65(2):105-114.
  • Devine BJ. Gentamicin therapy. Drug Intelligence and Clinical Pharmacy 1974;8:650-655. (Ideal body weight formula)
Privacy

Your numbers are calculated in your browser. Your last inputs and history are saved only on this device and you can clear them anytime.

BMI Calculator FAQ

Body Mass Index compares your weight to your height. It is calculated as weight in kg divided by height in meters squared.

  1. Enter your height.
  2. Enter your weight.
  3. Click calculate.
  4. Read your BMI value and the recommendations shown.

A common guideline is 18.5 to 24.9 for adults. Some guidelines use lower cut-offs for South Asians, so ask your doctor which range suits you.

No. BMI is a general indicator. It does not consider muscle mass, age, body type or medical history, so talk to a doctor before making health decisions.

Adult BMI ranges do not apply to children and teenagers, who are assessed against age and growth charts. Please ask a pediatrician.