Calculateur d'IMC pour les femmes
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What BMI actually measures
Body mass index compares your weight to your height. It is a fast, free screen that sorts adults into four bands, and it works well across large populations. What it cannot do is see inside your weight: BMI treats a kilogram of muscle and a kilogram of fat as exactly the same thing.
That single limitation is why two people with an identical BMI can have completely different bodies, and completely different health risks.
BMI categories
These adult cut-offs come from population data linking BMI to health outcomes. They are screening bands, not a diagnosis, and the same bands apply to women and men.
| Category | BMI range |
|---|---|
| Underweight | Below 18.5 |
| Normal weight | 18.5 to 24.9 |
| Overweight | 25 to 29.9 |
| Obese | 30 and above |
How BMI is calculated
The formula is simple:
BMI = weight (kg) / height (m)²
In imperial units, multiply by 703: weight (lb) / height (in)² × 703. For example, someone 1.78 m tall weighing 74 kg has a BMI of 74 / (1.78 × 1.78) = 23.4, which falls in the normal-weight band. This calculator handles both unit systems and the conversion for you.
Where BMI falls short
Because it uses only height and weight, BMI misses things that matter:
- It cannot tell muscle from fat. Athletes and muscular people are often misread as overweight.
- It ignores where you carry fat. Fat around the organs is the riskiest kind, and BMI cannot see it.
- It says nothing about the trend. A stable BMI can still hide muscle loss, which matters a lot during weight loss.
Treat your BMI as a prompt to look closer, not a verdict. Body fat percentage, waist-to-height ratio and FFMI tell you what the single number cannot.
See the fuller picture
This is exactly what BMI Kit is built for. Add your waist measurement above and your result also shows your waist-to-height ratio and an estimated body fat percentage, so you see the whole story instead of half of it. From there you can estimate your body fat or check your fat-free mass index.
Questions fréquentes
Is a BMI of 25 overweight?
A BMI of 25 sits right on the line between the normal and overweight bands, which run 18.5 to 24.9 and 25 to 29.9. At exactly 25 you are technically in the overweight range, but one point tells you very little on its own. If you are muscular, your body fat and waist-to-height ratio give you a far more honest read than the band alone.
What is a healthy BMI for my age?
The adult BMI bands (18.5 to 24.9 for normal weight) are the same at every adult age, but their meaning shifts. Older adults often carry slightly more weight safely, while losing muscle with age can keep BMI in the normal range even as body fat rises. Use BMI as a starting screen and pair it with body fat and waist-to-height for a clearer picture.
Does BMI work for muscular people and athletes?
Not well. BMI cannot tell muscle from fat, so a lean, muscular athlete can land in the overweight or even obese band despite low body fat. This is BMI's best-known blind spot. If you train seriously, your FFMI (fat-free mass index) and body fat percentage describe your body much more accurately.
Is BMI different for women and men?
The formula and the category cut-offs are identical for women and men. What differs is body composition: women naturally carry more essential fat, so the same BMI usually means a higher body fat percentage in a woman than in a man. That is why pairing BMI with a body fat estimate matters.
How is BMI calculated?
BMI is your weight in kilograms divided by your height in metres squared (kg/m²). In imperial units it is weight in pounds divided by height in inches squared, multiplied by 703. This calculator does the maths for you in either unit system and converts automatically.
Can you have a normal BMI and still be unhealthy?
Yes. A normal BMI can hide a high body fat percentage and excess fat around the organs, sometimes called normal-weight obesity. Because BMI only sees total weight, your waist-to-height ratio and body fat percentage are better at flagging this hidden risk.
À lire aussi
L'IMC ne distingue pas le muscle de la graisse et ignore l'âge, le sexe et la répartition des graisses. Voici ce qu'il fait de travers et comment bien l'utiliser malgré tout.
Le BMI et la masse grasse mesurent des choses différentes. Voici quand chacun est utile et pourquoi la masse grasse l'emporte généralement pour comprendre votre santé.
Insuffisance pondérale, poids normal, surpoids, obésité : ce que signifie chaque catégorie d'IMC, d'où viennent les seuils et comment les lire avec discernement.