Enter your height and weight to see the calculation.
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What your result means
BMI is calculated live using the WHO standard formula — weight in kilograms divided by height in meters squared. Under 18.5 is underweight, 18.5–24.9 is the healthy range, 25–29.9 is overweight, and 30 or above is obese.
Treat the number as a screening signal, not a diagnosis. Two people with the same BMI can have very different body compositions, waist measurements, and cardiometabolic risk.
Muscle is denser than fat, so athletes and people who strength-train often land in the "overweight" range while carrying low body fat. If that sounds like you, the Body Fat Calculator will read your situation more accurately.
The most useful signal from BMI is direction of travel — whether you're drifting toward a new category. To act on that, pair this with your daily calorie needs, and talk to a clinician before making meaningful changes.
Quick questions
Should I worry about a BMI of 25.1?
A sliver above 25 is not meaningfully different from 24.9. The category lines are useful for populations, not as a cliff for individuals. Trends over months matter more than crossing a line once.
Does BMI work the same for older adults?
In adults over 65, slightly higher BMIs (roughly 25–27) are often associated with better outcomes than being at the low end of "normal." BMI underestimates the protective value of preserved muscle and reserve at older ages.
What BMI should I target?
A healthy range, not a specific number. Plug different weights into this calculator to see what would land you around 22–24 for your height, then discuss with a clinician whether that's realistic for your body and goals.