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Calculate your body mass index (BMI) and your ideal weight



Your BMI (Body Mass Index)


What is BMI?

Body Mass Index (BMI) is a widely used tool that helps assess whether a person has a healthy body weight in relation to their height.
It provides a simple numerical value that can be used to categorize weight status and potential health risks.

While BMI does not directly measure body fat, it offers a general indication of whether your weight falls within a healthy range.

How Is BMI Calculated?

BMI is calculated using the following formula:

BMI = weight (kg) / [height (m)]²

For example, a person who weighs 70 kg and is 1.75 m tall would have a BMI of 22.9.

BMI Categories

  • Underweight: BMI less than 18.5
  • Normal weight: BMI between 18.5 and 24.9
  • Overweight: BMI between 25 and 29.9
  • Obesity: BMI 30 or higher

Why Use BMI?

  • Quick Assessment: Requires only height and weight.
  • Health Indicator: Helps identify potential health risks related to underweight or overweight conditions.
  • Widely Recognized: Used by healthcare professionals around the world.

Important Note

Although BMI is a useful screening tool, it does not account for muscle mass, bone density, or fat distribution.
For a more complete evaluation of your health, it's best to consult with a healthcare professional.

Body mass index (BMI): Enter height in centimeters and your weight in kg to calculate your body mass index:

Your height: centimeters

Your weight: Kg

Your body mass index (BMI): kg/m-2

Body mass index (BMI) table:
BMI (kg/m²) Interpretation
Under 16,5 Severely underweight
From 16,5 to 18,5 Underweight
From 18,5 to 25 Normal (healthy weight)
From 25 to 30 Overweight
From 30 to 35 Obese Class I (Moderately obese)
From 35 to 40 Obese Class II (Severely obese)
Over 40 Obese Class III (Very severely obese)

Your ideal weight (Lorentz formula)


What Is the Lorentz Ideal Weight Formula?

The Lorentz Formula is a simple mathematical method used to estimate an individual's ideal body weight based on their height and sex.
It was developed by the French physician Paul Lorentz in the early 20th century and remains a popular tool in Europe.

While it does not take into account body composition (such as muscle or fat mass), it provides a quick reference point for evaluating weight in relation to height.

How Is It Calculated?

The Lorentz Formula differs slightly for men and women:

  • For Men: Ideal Weight (kg) = Height (cm) - 100 - [(Height (cm) - 150) / 4]
  • For Women: Ideal Weight (kg) = Height (cm) - 100 - [(Height (cm) - 150) / 2]

Example: A woman who is 165 cm tall would have an ideal weight of:
165 - 100 - [(165 - 150) / 2] = 65 - 7.5 = 57.5 kg

Why Use the Lorentz Formula?

  • Simple & Fast: Requires only your height and gender.
  • Non-technical: No scales or calculations involving BMI or fat percentages.
  • Traditional Benchmark: Commonly used in France and other European countries.

Important Considerations

The Lorentz Formula gives an estimate, not an absolute value. It does not account for muscle mass, bone structure, or overall body composition.
For a more accurate picture of your health, consider combining it with other tools such as BMI or body fat analysis.

Ideal weight according to Lorentz:

Enter your height in centimeters and specify your gender to calculate your ideal weight:

Your height: cm

Your gender: Male Female

Estimate your ideal weight: Kg
Your weight may be considered excessive if it exceeds: Kg