BMI Calculator
BMI = weight (kg) ÷ height (m)². Use it as a quick screening metric — combine with waist circumference, activity level, and professional advice for a fuller picture.
Inputs
Results
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Enter height and weight
Understanding BMI
The World Health Organization classifies adult BMI below 18.5 as underweight, 18.5–24.9 as normal range, 25.0–29.9 as overweight, and 30 or above as obesity class I+. Athletes with high muscle mass and older adults who have lost muscle may get misleading scores — BMI is a population-level screen, not a personal diagnosis.
Ideal weight range shown here is the weight span that would place you near the middle of the “normal” BMI band for your height — useful as a rough target, not a prescription. Children and teens need age- and sex-specific percentiles; this page uses adult cutoffs only.
For sustainable change, pair nutrition guidance with resistance training, sleep, and stress management. If you are pregnant, have an eating disorder, or chronic disease, discuss any target weight with a clinician rather than relying on an online calculator alone.
FAQ
Does gender change the formula?
The BMI formula is the same; we only adjust explanatory text slightly. Clinical risk thresholds can differ by context — ask your doctor.
Is BMI accurate for Indians?
Some guidelines suggest lower waist or BMI action thresholds for South Asian populations — use this tool as a starting point, not a rule.
What about body fat percentage?
DEXA, calipers, or smart scales estimate fat — each has error. BMI is cheaper and faster but less specific.
Why is my needle clipped?
Extreme BMIs map to the bar edges so the gauge stays readable.
Does switching cm/ft or kg/lb keep my numbers?
Yes — we convert the value you entered so height and weight stay consistent when you change units.