BMI Calculator β Body Mass Index
Calculate your Body Mass Index using the WHO formula. Find your BMI category and healthy weight range.
Your height in centimeters
Your weight in kilograms
BMI Formula
Body Mass Index (BMI) is an indicator developed by the World Health Organization (WHO) to assess the correspondence of weight to height. The Quetelet formula divides weight in kilograms by the square of height in meters.
Examples
About BMI Calculator
Body Mass Index (BMI) is a numerical indicator used by the World Health Organization for screening assessment of the correspondence of weight to height. BMI is calculated using the Quetelet formula: weight in kilograms divided by the square of height in meters.
The calculator automatically determines your category on the WHO scale: from severe underweight (BMI < 16) to Class III obesity (BMI β₯ 40). It also shows the normal weight range for your height (BMI 18.5β24.9).
It's important to remember that BMI is an approximate indicator. It doesn't account for the ratio of muscle to fat tissue, age, sex, or body type. For an accurate health assessment, consult a doctor.
Benefits
WHO Formula
Calculation uses the official World Health Organization formula with classification into 7 categories from underweight to Class III obesity.
Visual Scale
A clear color-coded BMI scale with a position indicator helps quickly assess the result and see how close you are to the normal range.
Healthy Weight Range
The calculator shows the normal weight range for your height (BMI 18.5β24.9), helping set a specific goal.
FAQ about BMI
What is BMI?
BMI (Body Mass Index) is a numerical indicator characterizing the ratio of a person's weight to height. Calculated by the formula: weight (kg) Γ· height (m)Β². Developed by Belgian scientist Adolphe Quetelet and recommended by WHO for screening assessment.
What BMI is considered normal?
According to the WHO classification, normal BMI is in the range of 18.5β24.9. Values below 18.5 indicate underweight, 25 to 29.9 β overweight, 30 and above β various degrees of obesity.
What are the limitations of BMI?
BMI doesn't distinguish between muscle and fat tissue, so athletes with developed muscles may have elevated BMI with normal fat content. BMI also doesn't account for age, sex, body type, or fat distribution.
How is BMI calculated?
BMI = weight (kg) Γ· height (m)Β². For example, with weight 70 kg and height 175 cm: BMI = 70 Γ· (1.75 Γ 1.75) = 70 Γ· 3.0625 β 22.86. This value falls in the 'Normal' category (18.5β24.9).
Is it suitable for children?
This calculator is designed for adults (18+). For children and adolescents, special BMI percentile charts are used that account for sex and age, developed by the WHO.