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Calculateur d'IMC

Body Mass Index (BMI) is a quick screening number that compares your weight to your height. It is used worldwide by clinicians, insurers and fitness coaches as a rough indicator of whether someone is underweight, in a healthy range, overweight, or obese. Our free BMI calculator handles both metric (kg/m) and imperial (lb/ft-in) units, shows the WHO category your result lands in, and tells you the weight gain or loss needed to reach the healthy range.

Échelle IMC

Insuffisance pondérale
<18.5 Normal
18.5–24.9 Surpoids
25–29.9 Obèse
≥30

Votre IMC

IMC
Catégorie
Plage de poids sain
Poids à perdre/prendre

Entrez la taille et le poids ci-dessus

Catégories IMC (norme OMS)

Insuffisance pondérale Moins de 18,5
Poids normal 18.5 – 24.9
Surpoids 25.0 – 29.9
Obèse (classe I) 30.0 – 34.9
Obèse (classe II) 35.0 – 39.9
Obèse (classe III) 40.0 and above
Remarque : BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, age, or ethnicity. Consult a healthcare professional for a complete health assessment.
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À propos de BMI Calculator

Body Mass Index (BMI) is a quick screening number that compares your weight to your height. It is used worldwide by clinicians, insurers and fitness coaches as a rough indicator of whether someone is underweight, in a healthy range, overweight, or obese. Our free BMI calculator handles both metric (kg/m) and imperial (lb/ft-in) units, shows the WHO category your result lands in, and tells you the weight gain or loss needed to reach the healthy range.

Comment l'utiliser

  1. Select your preferred unit system — metric (kg/cm) or imperial (lb/ft).
  2. Enter your weight and height into the labeled fields.
  3. Your BMI and WHO weight category appear instantly as you type.
  4. Read the healthy weight range and the weight change needed to reach it.
  5. Use the metric/imperial toggle to switch between unit systems.

Formule et méthodologie

BMI = weight (kg) / [height (m)]². In imperial: BMI = [weight (lb) / height (in)²] × 703.

Cas d'usage courants

  • Checking your weight category before a doctor visit or health screening
  • Tracking BMI changes during a weight loss or muscle gain program
  • Assessing health risk factors for insurance or wellness programs
  • Calculating BMI for family members including children and teenagers
  • Understanding the weight range needed for a specific BMI target

Questions fréquentes

A BMI between 18.5 and 24.9 is considered healthy by WHO standards. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese. BMI is a screening tool, not a diagnostic — athletes with high muscle mass may have a high BMI despite low body fat.
BMI is a useful population-level screening tool but has limitations for individuals. It does not account for muscle mass, bone density, body composition, or fat distribution. Athletes, older adults, and pregnant women may get less accurate results. For a full health assessment, consult your doctor.
The formula is different but the result is identical. Metric uses kilograms and meters (BMI = kg/m²). Imperial uses pounds and inches (BMI = [lb/in²] × 703). Our calculator handles both automatically — just pick your preferred units.

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