BMI (Body Mass Index) Calculator
Instantly check your Body Mass Index to understand where you stand on the healthy weight spectrum. Our tool is fast, free, and based on WHO standards.
Calculate Your BMI
Enter your details below.
Your Result
This is a screening tool, not a medical diagnosis.
Your BMI result will be displayed here.
About the BMI (Body Mass Index) Calculator
The BMI Calculator helps you quickly determine your Body Mass Index — a numerical value that estimates your body fat based on your height and weight. It’s a globally recognized health indicator used to assess whether you are underweight, at a healthy weight, overweight, or obese. This Body Mass Index calculator is accurate, fast, and suitable for both adults and children.
What Is BMI?
BMI (Body Mass Index) is a simple mathematical ratio between your weight and height. It’s widely used by healthcare professionals to categorize weight ranges and potential health risks. Although it doesn’t directly measure body fat, BMI correlates strongly with body composition and helps in identifying weight-related health conditions.
A BMI value helps indicate whether your weight is in a healthy range for your height. For example:
- BMI below 18.5: Underweight
- BMI 18.5 – 24.9: Normal (Healthy) weight
- BMI 25 – 29.9: Overweight
- BMI 30 or above: Obese
How to Use the BMI Calculator
- Enter your weight (in kilograms or pounds).
- Enter your height (in centimeters or inches).
- Click “Calculate BMI” to instantly get your BMI result and health category.
This online BMI calculator works for both men and women and provides an easy way to understand your health status at a glance.
BMI Formula
The Body Mass Index is calculated using the following formula:
- Metric Formula:
BMI = weight (kg) / [height (m)]² - Imperial Formula:
BMI = (weight (lb) / [height (in)]²) × 703
The calculator automatically applies the correct formula based on the units you select, ensuring accurate BMI results for any measurement system.
Understanding Your BMI Result
While BMI is a great starting point, it’s important to remember that it doesn’t distinguish between muscle and fat. For example, athletes may have a high BMI due to muscle mass, not excess fat.
Use your BMI score as a general health indicator, and consult a healthcare professional for personalized advice regarding your body composition and ideal weight.
BMI Categories for Adults
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Possible nutritional deficiency |
| 18.5 – 24.9 | Healthy Weight | Low risk (ideal range) |
| 25 – 29.9 | Overweight | Increased risk of health issues |
| 30 or above | Obese | High risk of chronic diseases |
BMI for Children & Teenagers
For children and teens, BMI is interpreted differently. The child BMI calculator uses both age and gender along with height and weight to determine BMI percentile. This percentile shows how a child’s BMI compares with others of the same age and sex.
- Below 5th percentile: Underweight
- 5th – 85th percentile: Healthy weight
- 85th – 95th percentile: Overweight
- Above 95th percentile: Obese
Ideal BMI and Healthy Weight Range
An ideal BMI for most adults is between 18.5 and 24.9. To find your ideal weight, you can use the BMI formula in reverse or use ourIdeal Weight Calculator.
Why Use This BMI Calculator?
- Instant and accurate BMI calculation for both adults and kids.
- Supports both metric (kg/cm) and imperial (lb/inch) units.
- Includes BMI chart and classification for better understanding.
- Works seamlessly on mobile and desktop devices.
This free Body Mass Index calculator is ideal for individuals, health enthusiasts, and fitness coaches who want quick, reliable insights into body weight status.
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Tips & FAQs
Pro Tips
- For the most accurate results, weigh yourself in the morning before eating or drinking.
- Use this tool as a starting point, not a final diagnosis. Consult a healthcare professional for personalized advice.
- Remember that BMI doesn't account for body composition. If you are very muscular, your BMI may be in the 'overweight' category even if you have low body fat.