BMI Calculator

Estimating your BMI manually requires squaring your height in metres and dividing your weight, a step many people get wrong, especially when converting between feet, inches, and centimetres. Our BMI calculator eliminates the arithmetic and also tells you:

• Your BMI category, instantly colour-coded so you can see at a glance where you stand.
• Your healthy weight range, the span of weights that would place you in the Normal BMI band for your specific height. This is far more useful than a generic "you should weigh X kg" chart.
• A visual scale, a colour-banded bar showing where your BMI sits relative to the Underweight, Normal, Overweight, and Obese zones.

The healthy weight range output is particularly practical. Instead of a single target weight, it gives you a window, for example, a person who is 165 cm tall has a healthy range of 50.3–67.9 kg. This helps set realistic, medically grounded goals rather than chasing an arbitrary number.

If you are tracking a weight-loss or weight-gain programme, you can return to this calculator each month and compare results. For quantifying how much your weight has changed in percentage terms, the Percentage Change Calculator is a handy companion tool.

Adults monitoring weight over time. Anyone who wants a quick, evidence-based snapshot of where their weight stands relative to health guidelines will find this tool useful. It takes under 30 seconds and requires no medical appointment.

People with a family history of metabolic disease. Type 2 diabetes, hypertension, and heart disease run strongly in Indian families. Regularly checking your BMI, ideally every 3 months, helps detect an upward trend early, when lifestyle changes are most effective.

Individuals starting a fitness or diet programme. A BMI check at the start of a programme provides a baseline. Revisiting it monthly lets you measure progress objectively. For families tracking multiple members' health, you can run the BMI calculator back-to-back for each person and note individual ranges.

Corporate wellness coordinators and healthcare workers. Occupational health assessments in India routinely include BMI screening. This tool lets you perform quick checks without needing a dedicated software system.

Young adults aged 18–25. This is a life stage when body weight often shifts due to college schedules, sedentary desk jobs, or changing diets. Establishing a healthy BMI target early reduces the risk of lifestyle disease in later decades.

Pregnant women (for reference only). BMI calculated before pregnancy is used by obstetricians to recommend healthy gestational weight gain. During pregnancy, a standard BMI calculator is not appropriate for tracking weight, consult your doctor for trimester-specific guidance.

BMI (the primary result) is the core output, your Body Mass Index rounded to one decimal place. A number below 18.5 suggests you may be underweight and at risk of nutritional deficiencies, bone loss, or anaemia. A number between 18.5 and 24.9 falls in the globally healthy range (though Indian adults should ideally aim for 18.5–22.9 per ICMR guidance). Between 25 and 29.9 indicates overweight status, associated with elevated risk of insulin resistance and hypertension. A BMI of 30 or above signals obesity, which significantly raises the risk of type 2 diabetes, sleep apnoea, and cardiovascular events.

Min Healthy Weight is the lower boundary of what you would weigh if your BMI were exactly 18.5. Falling below this number moves you into the Underweight zone.

Max Healthy Weight is the upper boundary corresponding to a BMI of 24.9. If your current weight exceeds this figure, you are in the Overweight or Obese range and may benefit from medical or lifestyle guidance.

Together, Min and Max Healthy Weight give you a personalised target window grounded in your own height rather than population averages. For example, a woman who is 158 cm tall has a healthy range of 46.2–62.2 kg, quite different from a man who is 180 cm tall (59.9–80.6 kg). These numbers can serve as milestone targets when working with a dietitian or personal trainer.

1. Select your Unit System, choose Metric (cm, kg) if you know your measurements in centimetres and kilograms, or Imperial (ft, lbs) if you prefer feet, inches, and pounds. The calculator will convert automatically.

2. Enter your Height, in Metric mode, type your height in centimetres (e.g. 165). In Imperial mode, enter feet in the first box and inches in the second (e.g. 5 ft 5 in). Measure against a wall for accuracy; avoid measuring after a long day when height can decrease by up to 1 cm.

3. Enter your Weight, in Metric mode, enter your weight in kilograms; in Imperial mode, enter pounds. Use a calibrated digital scale and measure at the same time of day (morning, before eating, is recommended for consistency).

4. Read your BMI, the large number in the result card updates instantly. The colour-coded badge below it tells you your category (Underweight, Normal weight, Overweight, or Obese) and the BMI range that category covers.

5. Check your Healthy Weight Range, this shows the weight span (in your selected unit) that corresponds to a Normal BMI for your height. Use this as your goal window rather than fixating on a single target weight.

6. Interpret and act, if your BMI is in the Normal range, maintain your current habits. If you are Overweight or Obese, consult a doctor or registered dietitian before making significant dietary or exercise changes. If you are Underweight, a nutritional assessment is advisable to rule out deficiencies or underlying conditions.