Underweight
< 18.5
May signal insufficient energy intake or an underlying condition, especially with unintentional weight loss.
Tool
BMI calculator
Body Mass Index (BMI) is a quick reference point, not a diagnosis. Enter your height and weight to see your BMI and where it falls.
Enter your height and weight to see the result.
BMI is a general screening tool and does not account for muscle, age, or body composition. For a real assessment, book a consultation.
How BMI is calculated
BMI = weight (kg) ÷ height (m)². The result is compared against standard ranges: underweight, normal, overweight, obesity.
No. It is a general screening measure that does not account for muscle mass, age, or body composition. A physician gives a real assessment in a consultation.
BMI is less accurate for very muscular people, pregnant women, and older adults. Those cases need an individual assessment from a doctor.
18.5-24.9 is the normal range for most adults, though the ideal number varies by age, sex and build.
No. Children and teenagers need age- and sex-specific growth charts, not the adult BMI formula.
Every few months is enough to track a trend. BMI is not a number worth checking daily.
BMI categories explained
The result maps to four ranges used by the World Health Organization for adults.
Normal range
18.5 - 24.9
Associated with the lowest average health risk for most adults.
Overweight
25 - 29.9
Extra body weight that can raise long-term health risk; often addressed with diet and activity changes.
Obesity
30+
Higher risk of type 2 diabetes, cardiovascular disease and joint strain. A structured nutrition plan usually helps most here.
What BMI does not measure: BMI does not distinguish muscle from fat, ignores where fat is stored, and says nothing about blood sugar, cholesterol, or other metabolic markers. Two people with the same BMI can have very different health profiles.
Want to understand your result?
BMI is only a starting point. Book a consultation for a full, safe assessment.