BMI Calculator (kg/cm)
Enter your weight in kilograms and height in centimeters to calculate your Body Mass Index and see your category on the BMI chart.
BMI Category Chart
| Category | BMI Range (kg/m²) |
|---|---|
| Underweight | Below 18.5 |
| Healthy weight | 18.5 - 24.9 |
| Overweight | 25.0 - 29.9 |
| Obesity Class I | 30.0 - 34.9 |
| Obesity Class II | 35.0 - 39.9 |
| Obesity Class III | 40.0 and above |
Formula used: BMI = weight (kg) / [height (m)]²
What is BMI and why use a kg chart?
BMI (Body Mass Index) is a quick screening tool that compares your weight to your height. In metric terms, it uses kilograms and meters, which is why many people search for a bmi calculator kg chart specifically. The value helps classify weight status into ranges such as underweight, healthy weight, overweight, and obesity classes.
It does not diagnose disease by itself, but it is useful for identifying whether your current weight may be associated with increased health risk.
How to calculate BMI in kilograms
The formula
BMI is calculated as:
BMI = Weight (kg) ÷ Height (m)²
Example: If your weight is 70 kg and your height is 170 cm (1.70 m):
- Square height: 1.70 × 1.70 = 2.89
- Divide weight by squared height: 70 ÷ 2.89 = 24.2
- Your BMI = 24.2 (healthy range)
BMI chart (kg/m² categories)
The following categories are commonly used for adults:
| Category | BMI (kg/m²) | General Risk Trend |
|---|---|---|
| Underweight | < 18.5 | Potential nutrient and energy deficiency risks |
| Healthy weight | 18.5 - 24.9 | Lower average risk for weight-related conditions |
| Overweight | 25.0 - 29.9 | Increased risk for metabolic and cardiovascular issues |
| Obesity Class I | 30.0 - 34.9 | High risk |
| Obesity Class II | 35.0 - 39.9 | Very high risk |
| Obesity Class III | ≥ 40.0 | Extremely high risk |
Healthy weight range chart by height (kg)
The table below shows an approximate healthy weight range based on BMI 18.5 to 24.9 for adults:
| Height (cm) | Healthy Weight Range (kg) |
|---|---|
| 140 | 36.3 - 48.8 |
| 145 | 38.9 - 52.4 |
| 150 | 41.6 - 56.0 |
| 155 | 44.4 - 59.8 |
| 160 | 47.4 - 63.7 |
| 165 | 50.4 - 67.8 |
| 170 | 53.5 - 72.0 |
| 175 | 56.7 - 76.2 |
| 180 | 59.9 - 80.7 |
| 185 | 63.3 - 85.2 |
| 190 | 66.8 - 89.9 |
| 195 | 70.3 - 94.7 |
| 200 | 74.0 - 99.6 |
How to interpret your result
- Below 18.5: You may benefit from evaluating nutrition quality and energy intake.
- 18.5 to 24.9: Generally considered a healthy weight zone for most adults.
- 25.0 and above: This may indicate rising risk for diabetes, high blood pressure, and other conditions.
Remember that trends are more useful than one-off measurements. Track your BMI over time along with waist size, blood pressure, activity level, and lab markers.
BMI limitations you should know
Even the best BMI calculator cannot capture every detail of health. BMI does not directly measure body fat percentage, muscle mass, bone density, or fat distribution.
- Very muscular people may have a high BMI but low body fat.
- Older adults may have normal BMI but lower muscle mass.
- Waist circumference often adds useful risk context.
Tips for improving BMI in a healthy way
If your BMI is above range
- Focus on portion control and whole foods.
- Walk daily and add strength training 2-3 times weekly.
- Prioritize sleep and hydration.
If your BMI is below range
- Increase calorie intake with nutrient-dense foods.
- Include protein at each meal.
- Build muscle through progressive resistance exercise.
Final thoughts
A bmi calculator kg chart is a simple starting point for understanding weight status in metric units. Use it regularly, interpret it with context, and combine it with healthy habits and professional advice for best results.