Maintaining a healthy body weight plays a key role in overall wellness. One of the simplest ways to assess whether your weight is within a healthy range is by using a BMI (Body Mass Index) calculator. Our free online BMI calculator helps you quickly find out if you are underweight, normal, overweight, or obese based on your height and weight.
BMI Calculator
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What is BMI?
Body Mass Index (BMI) is a numerical value calculated by dividing your weight (in kilograms) by your height (in meters squared). It is a widely accepted method to categorize weight in relation to height and provides an easy way to screen for potential health risks. While BMI is not a diagnostic tool, it gives a good indication of whether your weight falls into a healthy range.
Formula: 𝐵 𝑀 𝐼 = 𝑊 𝑒 𝑖 𝑔 ℎ 𝑡 ( 𝑘 𝑔 ) 𝐻 𝑒 𝑖 𝑔 ℎ 𝑡 ( 𝑚 2 ) BMI= Height(m 2 ) Weight(kg) For example, if you weigh 70 kg and your height is 1.75 m: BMI = 70 / (1.75 × 1.75) = 22.9 (Normal range).
Formula: 𝐵 𝑀 𝐼 = 𝑊 𝑒 𝑖 𝑔 ℎ 𝑡 ( 𝑘 𝑔 ) 𝐻 𝑒 𝑖 𝑔 ℎ 𝑡 ( 𝑚 2 ) BMI= Height(m 2 ) Weight(kg) For example, if you weigh 70 kg and your height is 1.75 m: BMI = 70 / (1.75 × 1.75) = 22.9 (Normal range).
BMI Categories
According to the World Health Organization (WHO), BMI ranges are classified as follows:
Underweight: Less than 18.5
Normal weight: 18.5 – 24.9
Overweight: 25 – 29.9
Obese (Class I): 30 – 34.9
Obese (Class II): 35 – 39.9
Obese (Class III): 40 and above
These categories help you understand your risk of developing lifestyle-related conditions such as diabetes, hypertension, and heart disease.
Why Use a BMI Calculator?
Accuracy: : Manual calculations are prone to mistakes. Our tool handles leap years and irregular month lengths perfectly.
Convenience: No need for a calendar or math—just enter your date of birth.
Time-Saving: Get your exact age in seconds.
User-Friendly: Designed with a clean, responsive interface that works on desktop and mobile devices.
Limitations of BMI
Although BMI is widely used, it has some limitations:
It does not distinguish between fat and muscle mass.
Athletes with high muscle mass may fall into the “overweight” category despite being healthy.
It does not directly measure body fat distribution.
For a complete health assessment, BMI should be used alongside other measurements like waist circumference, body fat percentage, and overall lifestyle.
How to Use the Online BMI Calculator
1. Enter your weight (kg or lbs).
2. Enter your height (cm, m, or feet & inches).
3. Click on “Calculate”.
4. Instantly view your BMI value and weight category.
Our BMI calculator is designed for ease of use, giving you quick insights into your weight status anytime, anywhere.
2. Enter your height (cm, m, or feet & inches).
3. Click on “Calculate”.
4. Instantly view your BMI value and weight category.
Our BMI calculator is designed for ease of use, giving you quick insights into your weight status anytime, anywhere.
Take the First Step Toward a Healthier You
Knowing your BMI is the first step in taking charge of your health. Whether your goal is weight loss, muscle gain, or simply maintaining a balanced lifestyle, our online BMI calculator can guide you in the right direction. Start today and keep track of your health with just a few clicks!