Curious where you stand on the health scale? Our BMI calculator gives you an instant, reliable reading of your Body Mass Index using just your height and weight. Whether you’re beginning a weight management journey or simply keeping an eye on your overall health, this tool has been built with guidance from Dietician and Nutritionist Avni Kaul, Dietician in Delhi, to give you a dependable starting point before deciding your next steps.
BMI, or Body Mass Index, is a numerical value calculated from your height and weight. Doctors, nutritionists, and health organisations worldwide use it as a preliminary screening tool to assess whether someone is underweight, of normal weight, overweight, or obese. According to the World Health Organization, BMI is worked out by dividing your weight in kilograms by the square of your height in metres.
While it doesn’t directly measure body fat, BMI correlates closely enough with more direct body composition methods to remain a trusted first checkpoint for millions of people tracking their health each year.
The formula behind BMI is straightforward:
BMI = Weight (kg) ÷ Height (m)²
For example, someone weighing 70 kg at a height of 1.7 m would have a BMI of roughly 24.2, placing them within the normal weight range. Our calculator does this maths for you instantly, removing any guesswork or manual error.
Getting your result takes less than a minute:
The tool is free, requires no sign-up, and gives you a result you can act on straight away.
BMI Range | Category |
Below 18.5 | Underweight |
18.5 to 24.9 | Normal weight |
25 to 29.9 | Overweight |
30 and above | Obese |
Falling into the underweight or obese categories does not automatically indicate a health problem, but it is a signal worth investigating further with a qualified professional, particularly if paired with other symptoms such as fatigue, irregular appetite, or hormonal imbalance.
BMI is a screening tool, not a diagnostic one. It doesn’t account for muscle mass, bone density, age, gender, or how fat is distributed across the body. An athlete with a high muscle percentage, for instance, may register a BMI in the “overweight” category despite carrying very little body fat.
This is exactly why a number on a calculator should never replace a proper consultation. Understanding the context behind your BMI, your lifestyle, medical history, and metabolic patterns, is where real, lasting change actually begins.
A BMI outside the normal range can be linked to several health concerns, including:
Spotting these risks early, well before they escalate, is one of the most valuable reasons to have your BMI checked regularly.
A BMI score tells you where you stand, but it rarely tells you why, or what to do next. This is exactly where personalised guidance becomes essential. As a Gold Medallist from the University of Delhi and Olympic Nutrition Advisor at Buenos Aires 2018, Avni Kaul brings genuine clinical expertise to help clients move beyond the numbers and build sustainable, healthy habits. Recognised with the Best Dietician Award in 2019, she has helped countless clients across Delhi achieve lasting results through nutrition plans built around their individual bodies, not generic templates.
Unlike one-size-fits-all diet plans found online, a consultation takes into account your medical history, lifestyle, food preferences, and long-term goals, something no calculator can ever replicate.
Is BMI an accurate measure of health?
BMI is a useful screening tool, but it doesn’t account for muscle mass, body composition, or fat distribution. It should be used alongside a professional assessment for a complete health picture.
A BMI between 18.5 and 24.9 is generally considered healthy for most adults, though individual factors can affect what’s ideal for a specific person.
BMI is calculated the same way for both, though differences in body composition mean results should be interpreted alongside other health indicators.
Checking your BMI every few months is a reasonable way to track progress, particularly if you’re following a structured weight management or nutrition plan.
Yes. Whether your BMI indicates underweight, overweight, or obesity, a dietician can help identify the underlying causes and design a suitable, sustainable plan for your body.
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