BMI Calculator (kg and cm)
Enter your weight in kilograms and height in centimeters to calculate your Body Mass Index instantly.
What is Body Mass Index (BMI)?
Body Mass Index is a simple screening value that compares your weight to your height. It helps estimate whether your current body weight is low, healthy, high, or in an obesity range for your height. BMI is widely used because it is fast, inexpensive, and easy to calculate.
This tool is designed specifically for metric units, so you can calculate BMI directly using kilograms (kg) and centimeters (cm).
BMI Formula in kg and cm
Since height is entered in centimeters:
height (m) = height (cm) ÷ 100
Example: If weight is 70 kg and height is 175 cm, then height in meters is 1.75. BMI = 70 ÷ (1.75 × 1.75) = 22.86.
Standard BMI Categories (Adults)
- Below 18.5: Underweight
- 18.5 to 24.9: Healthy weight
- 25.0 to 29.9: Overweight
- 30.0 to 34.9: Obesity Class I
- 35.0 to 39.9: Obesity Class II
- 40.0 and above: Obesity Class III
How to Use This BMI Calculator
Step 1: Enter your weight in kg
Use a recent measurement for better accuracy. Decimals are supported, such as 64.7 kg.
Step 2: Enter your height in cm
Use centimeters, for example 160, 172.5, or 183.
Step 3: Click Calculate BMI
You will see your BMI value, your category, and an estimated healthy weight range for your current height.
What Your Result Means
BMI is a population-level screening tool, not a full diagnosis. A high BMI can be linked with greater risk for conditions like hypertension, type 2 diabetes, and cardiovascular disease. A low BMI can sometimes indicate nutritional or health concerns.
Your result is most useful when combined with other indicators such as waist circumference, medical history, activity level, and lab values reviewed by a healthcare professional.
Limitations of BMI
- It does not directly measure body fat percentage.
- Very muscular people may have a high BMI without high body fat.
- It may not fully reflect individual differences in age, sex, and ethnicity.
- It is less accurate for children and teens without age-specific BMI percentiles.
Tips to Maintain a Healthy BMI Range
- Focus on whole foods: vegetables, fruit, lean protein, legumes, and whole grains.
- Build an exercise routine with both cardio and strength training.
- Sleep 7-9 hours consistently to support hormone balance and appetite control.
- Track your progress monthly instead of daily obsessing over small fluctuations.
- Consult a doctor or registered dietitian for personalized guidance.
Frequently Asked Questions
Is this BMI calculator for adults only?
Yes. The interpretation shown here is for adults. BMI for children and teens uses age- and sex-based percentile charts.
Can I use centimeters with decimal values?
Yes. You can enter values like 169.5 cm and the calculator will work correctly.
What is a good BMI target?
For most adults, a BMI between 18.5 and 24.9 is considered a healthy range. However, your ideal health target can vary based on your overall clinical picture.