Bmi Calculator
Calculate your Body Mass Index (BMI) using weight in kilograms and height in centimeters.
Result
Please check your inputs.
How to Use This Tool
Enter your weight in kilograms (kg) into the first input field.
Enter your height in centimeters (cm) into the second input field.
Click the 'Calculate' button to instantly compute your BMI.
View your BMI number and the corresponding weight category (e.g., underweight, normal, overweight, obese).
Use the result as a starting point to discuss your health with a professional.
What Is Bmi Calculator?
A BMI (Body Mass Index) calculator is a simple health screening tool that estimates body fat based on your weight relative to your height. It is widely used by healthcare providers and individuals to quickly categorize weight status and identify potential health risks. While BMI does not measure body fat directly, it provides a useful benchmark for adults, helping to assess if you are in a healthy weight range. Tracking your BMI over time can motivate lifestyle changes and support weight management goals, though it should always be considered alongside other health indicators.
Formula
The tool uses the metric BMI formula: BMI = weight (kg) ÷ [height (m)]². Since height is entered in centimeters, it is first converted to meters by dividing by 100. For example, if you weigh 70 kg and are 175 cm tall, your height in meters is 1.75, so BMI = 70 ÷ (1.75 × 1.75) ≈ 22.9. This number falls within the normal weight range (18.5–24.9).
Tips for Best Results
🧍 Use consistent units — always enter weight in kilograms and height in centimeters for accurate results.
📅 Check your BMI monthly — trends matter more than a single reading, especially during diet or exercise changes.
🏋️ Pair with waist measurement — BMI doesn't distinguish muscle from fat, so add waist circumference for a fuller picture.
👩⚕️ Consult a doctor — use your BMI as a conversation starter, not a diagnosis, especially if you are pregnant, elderly, or an athlete.
Frequently Asked Questions
Is BMI accurate for athletes?
BMI can overestimate body fat in athletes with high muscle mass because muscle weighs more than fat. Use body fat percentage measurements or consult a professional for a more accurate assessment.
What is a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered healthy. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese. These ranges may vary by ethnicity and age.
Can I use this calculator for children?
This tool is designed for adults aged 18 and over. For children and teens, BMI is interpreted using age- and sex-specific percentiles. Please consult a pediatrician for accurate assessment.