What this calculator does
Body mass index (BMI) compares weight with height. It is a quick screening measure for whether your weight sits in a healthy range, not a complete health assessment.
This calculator shows your BMI, the WHO category, the healthy weight range for your height and a target weight at BMI 22. It does not distinguish muscle mass from body fat.
BMI formula
BMI = weight (kg) ÷ height (m)² At 72 kg and 1.75 m, BMI is 23.5. Below 18.5 is underweight, 18.5–24.9 normal, 25–29.9 overweight and 30+ obesity.
How this calculator works
- 01
Enter height and weight
Use your current weight in kilograms and height in centimetres.
- 02
Read your category
The calculator classifies your BMI and shows the healthy weight range for your height.
- 03
Set a realistic target
Aim for the healthy range rather than a single ideal number.
Practical tips
- Waist circumference adds useful information about visceral fat.
- A sustainable rate of 0.5–1 kg weight change per week is a sensible target.
Frequently asked questions
What is a normal BMI?
For adults, 18.5–24.9 is considered normal weight. Age, sex, muscle mass and health conditions can affect how useful the number is.
Why is BMI misleading for athletes?
Muscle is denser than fat. A person with high muscle mass can have a high BMI while carrying little body fat.
Does BMI apply to children?
No. Children and teenagers are assessed using age- and sex-specific percentile charts, not adult BMI thresholds.
Data basis: 2026 · Annual constants live in structured JSON files and are updated once a year.
Results are unverified model calculations and do not replace tax, legal or financial advice.