BMI Calculator

Find Out Your Body Mass Index in SecondsUnderstanding your body weight in relation to your height is one of the simplest ways to get a quick snapshot of your overall health. Our free BMI Calculator gives you an instant reading so you can make more informed decisions about your lifestyle, diet, and fitness goals. Whether you are just starting a wellness journey, tracking progress, or simply curious about where you stand, this tool delivers clear, accurate results with no complicated steps. Enter two numbers, click a button, and get answers that actually mean something.What Is BMI and How Is It CalculatedBMI stands for Body Mass Index. It is a numerical value derived from your weight and height, and it gives health professionals and individuals a reliable starting point for assessing whether a person falls within a healthy weight range for their size.The formula is straightforward:BMI equals your weight in kilograms divided by your height in meters squared.Written out, that looks like this:BMI = weight (kg) divided by height (m) x height (m)For example, if you weigh 70 kilograms and your height is 1.75 meters, you would multiply 1.75 by 1.75 to get 3.0625, and then divide 70 by 3.0625. Your BMI would be approximately 22.9, which falls within the normal range.Once you have your number, it fits into one of four standard categories established by the World Health Organization:Underweight: BMI below 18.5
This may indicate insufficient body weight relative to height, which can sometimes point to nutritional deficiencies or other health concerns worth discussing with a doctor.Normal Weight: BMI between 18.5 and 24.9
This range is generally associated with a lower risk of weight-related health conditions. It is considered the healthy target range for most adults.Overweight: BMI between 25 and 29.9
This range suggests that body weight is above what is typically considered optimal for your height. Lifestyle adjustments such as diet changes and increased physical activity are often recommended.Obese: BMI of 30 or higher
A BMI in this category is associated with a higher risk of conditions such as type 2 diabetes, heart disease, and high blood pressure. Consulting a healthcare provider is strongly encouraged.How to Use This CalculatorUsing the BMI Calculator is simple and takes less than a minute. Just follow these steps:Step 1: Enter Your Weight
Type your current body weight into the weight field. Make sure your number is in kilograms. If you normally measure in pounds, divide your weight in pounds by 2.205 to convert it to kilograms before entering it.Step 2: Enter Your Height
Type your height into the height field. Make sure your number is in meters. If you know your height in centimeters, divide by 100 to convert to meters. For example, 170 centimeters becomes 1.70 meters. If you know your height in feet and inches, multiply your total height in inches by 0.0254 to get meters.Step 3: Click Calculate
Press the Calculate button. The tool will instantly apply the BMI formula and display your result on the screen.Step 4: Read Your Result
Your BMI number will appear along with your category. You will immediately know whether your result falls into the underweight, normal weight, overweight, or obese range, along with a brief explanation of what that means for you.Step 5: Use the Information Wisely
Take note of your result and consider it as one useful data point in your overall health picture. If you have any concerns about your reading, the most important next step is always to speak with a qualified healthcare professional.Frequently Asked QuestionsQuestion: Is BMI an accurate measure of my health?BMI is a useful screening tool, but it is not a complete picture of your health on its own. It does not distinguish between muscle mass and fat mass, which means a very muscular person might receive an overweight or obese BMI reading even though their body fat percentage is low. Similarly, someone with a normal BMI could still carry excess body fat if they have low muscle mass. BMI also does not account for factors like age, sex, bone density, or where fat is distributed on your body. Doctors use BMI as one piece of information alongside other assessments such as blood tests, waist measurements, and lifestyle evaluations to get a fuller understanding of a patient's health.Question: Can I use this calculator for children or teenagers?This calculator is designed for adults aged 18 and older. BMI works differently for children and adolescents because their bodies are still growing and developing. For people under 18, BMI is assessed using age and sex-specific growth charts, which compare a child's BMI to others of the same age and sex rather than using fixed category cutoffs. If you want to assess a child's weight status, a pediatrician or family doctor is the best resource and can use the appropriate tools designed specifically for younger individuals.Question: How often should I check my BMI?There is no strict rule, but checking your BMI every few months or whenever your weight changes significantly is a reasonable approach for most adults. If you are actively working toward a weight loss or weight gain goal, tracking it monthly can help you monitor progress over time. However, because BMI is just one indicator among many, obsessing over the number on a daily or weekly basis is generally not helpful and can sometimes be counterproductive. Focus on building healthy habits, and let your BMI reading be one of several tools you use to check in on your overall wellbeing rather than the sole measure of your success.DisclaimerThe BMI Calculator on this page is intended for informational purposes only and does not constitute medical advice. BMI is a general screening tool and may not be appropriate for all individuals. Please consult a qualified healthcare professional before making any decisions about your health, diet, or fitness routine based on your results.