Free BMI Calculator – Check Your Body Mass Index Instantly
BMI Calculator
Enter your weight (kg) and height (cm):
BMI Classification Chart (WHO)
| BMI Range | Category |
|---|---|
| Less than 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25 – 29.9 | Overweight |
| 30 – 34.9 | Obesity Class I |
| 35 – 39.9 | Obesity Class II |
| 40 or more | Obesity Class III |
What is BMI and Why is it Important?
Body Mass Index (BMI) is a simple calculation that helps assess whether an individual’s weight is appropriate for their height. It is calculated using the formula: BMI = weight (kg) / height (m²). This number is then used to classify individuals into categories like underweight, normal weight, overweight, or obese.
Use Our Free BMI Calculator Online
Our free and easy-to-use BMI calculator online helps you instantly check your body mass index. Simply input your weight in kilograms and height in centimeters to find out your BMI and what it means for your health. No sign-up required — just quick, accurate results.
BMI Categories and What They Mean
Based on World Health Organization (WHO) standards, BMI is categorized as follows:
- Underweight: BMI below 18.5
- Normal weight: BMI between 18.5 and 24.9
- Overweight: BMI between 25 and 29.9
- Obese (Class I): BMI between 30 and 34.9
- Obese (Class II): BMI between 35 and 39.9
- Obese (Class III): BMI 40 or more
What is a Healthy BMI?
A healthy BMI range is considered to be between 18.5 and 24.9. Staying within this range reduces your risk of developing chronic conditions such as heart disease, diabetes, and high blood pressure.
How to Maintain a Healthy BMI
To stay within the healthy BMI range, focus on:
- Eating a balanced, nutritious diet rich in fruits, vegetables, lean proteins, and whole grains
- Staying physically active with regular exercise (at least 150 minutes per week)
- Drinking enough water and avoiding sugary drinks
- Getting adequate sleep and managing stress
Is BMI Always Accurate?
While BMI is a useful general guideline, it doesn’t measure muscle mass, bone density, or fat distribution. Athletes and muscular individuals may have a higher BMI without being overweight. Always consult a healthcare professional for a complete health assessment.
Why Choose Our BMI Calculator?
Our free BMI calculator is fast, reliable, and mobile-friendly. Whether you're tracking your health goals or just curious, it's the perfect tool to get a quick overview of your body composition. Bookmark this page and check your BMI anytime!
Frequently Asked Questions (FAQs)
What is the best BMI calculator?
The best BMI calculator is one that is simple, accurate, and provides clear health suggestions — just like ours!
Can I use this BMI calculator for kids?
BMI charts for children use age and sex-specific percentiles. This calculator is best suited for adults.
Is BMI a good measure of health?
BMI is a quick screening tool, but it’s not a complete measure of health. It should be used alongside other indicators like waist circumference, diet, activity levels, and overall well-being.
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