❤️ BMI Calculator
BMI (Body Mass Index) gives a quick indication of whether your weight is appropriate for your height. Enter your weight and height to see your category instantly, along with an explanation of the formula behind it. Note: this is a general estimate, not medical advice.
Your BMI
22.9
Category
Healthy weight
Based on the WHO classification for adults.
Convert your height to metres: 175 cm ÷ 100 = 1.75 m
Square your height: 1.75 × 1.75 = 3.0625
Divide your weight by that number: 70 ÷ 3.0625 = 22.9
Formula
BMI = weight (kg) ÷ height (m)²
You divide your weight in kilograms by the square of your height in metres. Someone of 70 kg and 1.75 m therefore has a BMI of 70 ÷ (1.75 × 1.75) ≈ 22.9. This is a general estimate, not a medical diagnosis — muscle mass and fat distribution are not taken into account.
What the variables mean
- BMI
- Body Mass Index, the result
- gewicht
- Your body weight — kilograms (kg)
- lengte
- Your body height — metres (m)
Steps
- 1Convert your height to metres (175 cm = 1.75 m).
- 2Square your height: 1.75 × 1.75 = 3.0625.
- 3Divide your weight by that number and compare the result with the BMI table: 70 ÷ 3.0625 ≈ 22.9.
BMI categories (WHO)
| BMI range | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5 – 24.9 | Healthy weight |
| 25.0 – 29.9 | Overweight |
| ≥ 30.0 | Obesity |
Based on the WHO classification for adults; not applicable to children or pregnant women.
tips
- Weigh yourself in the morning, after getting up and before breakfast, for the most consistent measurement.
- Follow the trend over weeks rather than day to day. Your weight normally fluctuates by 1 to 2 kilos a day.
warnings
- BMI is not a medical diagnosis. A result outside the healthy range does not automatically mean you are unhealthy.
- Do not use these values for children, pregnant women or elite athletes; different measures apply to those groups.
advantages
- Quick to calculate from just two figures you can measure yourself.
- Standardised worldwide, which makes results comparable.
limitations
- BMI does not distinguish muscle from fat, so muscular people score too high.
- The distribution of fat is ignored, while abdominal fat matters more for health.
commonMistakes
- Entering height in centimetres without converting to metres.
- Treating BMI as a medical diagnosis, when it is only a general indication.
- Ignoring muscle mass, so muscular people are wrongly classified as "overweight".
useCases
- Keeping a broad eye on your health over a longer period.
- A starting point for a conversation with your doctor or dietitian.
- Tracking progress towards a weight goal, alongside other measurements.