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.
結果
22.9
Your BMI
- Category
- Gezond gewicht
How this was calculated
- 1Convert your height to metres175 cm ÷ 100 = 1.75 m
- 2Square your height1.75 × 1.75 = 3.0625
- 3Divide your weight by that number70 ÷ 3.0625 = 22.9
公式
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)
ステップ解説
- 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.
計算例
Weight 82 kg, height 180 cm
→ BMI ≈ 25.3 → slightly overweight
Weight 58 kg, height 165 cm
→ BMI ≈ 21.3 → healthy weight
Weight 95 kg, height 170 cm
→ BMI ≈ 32.9 → obesity
Reference table
| 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.
よくある間違い
- 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".
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.
Important to know
- 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.
活用シーン
- 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.
よくある質問
What is a healthy BMI?
For adults, a BMI between 18.5 and 25 is considered a healthy weight according to the World Health Organization.
Is BMI accurate for athletes?
For very muscular people BMI can read too high, because muscle weighs more than fat. Use additional measurements such as body fat percentage in that case.
Does this BMI apply to children?
No. Children use separate age- and sex-specific growth charts instead of these fixed thresholds.
Is BMI the same as body fat percentage?
No, BMI only looks at weight and height and does not measure fat directly. For a more precise picture of body fat, use a separate measurement such as the Navy method.
In summary
BMI is a useful starting point, not a verdict. Use it to spot a trend and discuss an unusual result with your doctor, alongside factors such as waist circumference, fitness and blood values.
Sources
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