Most people meet BMI as a single number that arrives with a label attached — normal, overweight, obese. That label decides how they feel for the rest of the day, which is unfortunate, because BMI was never designed to judge an individual. It was built to describe populations.
Used properly, it is still genuinely useful. It just answers a narrower question than most people think.
What BMI actually measures
BMI is your weight in kilograms divided by your height in metres squared. That is the whole calculation. It asks one thing: is your weight proportionate to your height? It does not know whether that weight is muscle or fat, where you carry it, or how fit you are.
This is why a muscular athlete can register as overweight while someone sedentary with the same number carries a very different health risk. The number is identical; the situation is not.
The standard ranges
- Below 18.5 — Underweight
- 18.5 to 24.9 — Normal
- 25 to 29.9 — Overweight
- 30 and above — Obese
One caveat matters, and it matters more for Indian readers. BMI categories were drawn from population data, and body composition differs between populations — so the same number does not carry the same meaning for everybody. Where your own number sits on that scale, and what it means for you specifically, is a question for your doctor rather than for a chart or for an article like this one. If a "normal" reading is the only reassurance you have, that is worth raising at your next appointment.
Why a height-weight chart beats a formula
BMI tells you where you are. It does not tell you where to go. "Get under 25" is arithmetic, not a goal — and it ignores that men and women of the same height have genuinely different healthy ranges.
A height-weight chart gives you a target range in kilograms, separated by gender. Instead of an abstract score, you get something like: at 5 feet 9 inches, aim for 67 to 72 kilograms. That is a number you can act on, weigh yourself against, and reach.
A range also matters more than a single figure. Weight moves by a kilo or two with hydration, salt and the time of day. Chasing one exact number invites frustration; landing anywhere inside a healthy band is the actual win.
Setting a goal you will actually reach
Once you have a target range, the gap between it and your current weight is your goal. If you are 88 kilograms and your range is 67 to 72, the honest number is 16 kilograms — measured to the nearest edge, not the middle.
A sustainable rate is roughly half a kilo per week. That comes from a daily deficit of about 500 calories below maintenance. Sixteen kilograms at that pace is around seven to eight months — slower than any advertisement promises, and far more likely to still be true a year later.
- Aim for 0.5 kg per week, not 2 kg
- Track weekly averages rather than daily readings
- Expect plateaus — they are normal, not failure
- Protein and sleep protect muscle while you lose fat
When the number is not the whole story
If you sit in the normal range but feel exhausted, if your waist has grown while the scale has not moved, or if you have a family history of diabetes or heart disease, BMI is not the measurement that will tell you what is happening. Waist circumference, blood sugar, lipids and blood pressure will.
This article is general wellness education, not medical advice. Please consult your physician before starting any new nutrition or exercise programme, particularly if you have an existing health condition.