Calculate BMI in kilograms and cm
Get quick BMI calculations, body weight categories, and personalized weight adjustments using the metric system.
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Provide your height and weight to calculate your Body Mass Index (BMI).
Calculated Result
You have a Normal Weight.
Weight Insights
Why use the Metric System?
The metric system is the international standard (SI) for measuring height (meters or centimeters) and mass (kilograms). It is utilized by healthcare professionals, researchers, and organizations worldwide (including the World Health Organization) to maintain consistency in clinical evaluations.
In standard clinical settings, BMI is strictly evaluated using the metric formula. If you are tracking your fitness progress globally or consulting a doctor, calculating your BMI directly in kg and cm provides immediate, standard results without unit conversion rounding discrepancies.
The Metric Formula
BMI = Weight (kg) / Height² (m²)Example: For a height of 180 cm (1.80 meters) and a weight of 75 kg:
- Convert height to meters: 180 / 100 = 1.8 m
- Square the height: 1.8 × 1.8 = 3.24 m²
- Divide weight by height squared: 75 / 3.24 = 23.15
- Calculated BMI = 23.2 kg/m²
Metric weight classification
| Metric BMI (kg/m²) | Weight Category | Normal Weight Equivalents |
|---|---|---|
| Less than 18.5 | Underweight | Below healthy weight guidelines |
| 18.5 – 24.9 | Normal Weight | Optimal / Healthy range |
| 25.0 – 29.9 | Overweight | Above normal boundaries |
| 30.0 – 34.9 | Class I Obesity | Clinically high body weight |
| 35.0 or higher | Severe Obesity | Extremely high clinical risk |