BMI Calculator – Check Your Body Mass Index

Use this calculator to check your body mass index (BMI) and gain valuable insight into your health. Our free online BMI calculator for adults is a simple, effective tool designed to help you understand your body composition. BMI is widely used as a general indicator of whether a person has a healthy body weight. By providing a clear starting point, our body weight calculator empowers you to make informed decisions on your wellness journey.

Calculate Your BMI Instantly

Ready to find out, "what is my BMI?" It's easy. Simply enter your height and weight to find out your BMI. Our versatile calculator works with the units you're most comfortable with, whether you're using a BMI calculator metric (kilograms and meters) or a BMI calculator imperial (pounds and inches).

This adult BMI calculator will instantly perform the BMI calculation and present you with your score, along with an interpretation of where you fall on the health spectrum. It's the first step toward understanding your body better.

Understanding Body Mass Index (BMI)

To get the most out of your result, it's important to understand the core concepts behind this key health metric.

BMI Definition

Body mass index (BMI) is a measurement of a person's leanness or corpulence based on their height and weight, and is intended to quantify tissue mass. It's a standardized screening tool used by healthcare professionals worldwide to assess weight categories that may be associated with health risks.

BMI Formula

The question "how to calculate BMI?" is answered with a straightforward formula. BMI is calculated by dividing your weight in kilograms by your height in meters squared ( kg/m ²). Our calculator automates this process, saving you the math and providing an immediate, accurate result whether you enter your weight in kg or pounds.

What Your BMI Result Means: Health Categories

Once you have your BMI score, you can see where it fits within the standard World Health Organization (WHO) classifications. This helps you understand your current weight status.

• Underweight: Below 18.5
• Normal weight: 18.5 – 24.9
• Overweight: 25.0 – 29.9
• Obese: 30.0 and above

BMI Calculators for the Whole Family

While our primary tool is designed for adults, we understand that health is a family affair.

• BMI Calculator for Women & Men: The BMI formula is the same for adult men and women. The interpretation of the results is also standardized, making this tool equally effective for all adults.
• BMI Calculator for Kids & Children: A BMI calculator for children uses the same formula, but the results are interpreted differently. For those under 20, BMI is plotted on age- and sex-specific percentile charts. A child's BMI percentile indicates their body size in comparison to other children of the same age and sex. Always consult a pediatrician to interpret a child's BMI.

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Supporting Your Health Journey

Your BMI is a data point—a valuable one, but it's not a complete diagnosis of your health. It doesn't distinguish between fat and muscle mass. Use your result as a catalyst for positive action and conversation with a healthcare provider.

• Focus on Healthy Habits: Regardless of your BMI, prioritize a balanced diet, regular physical activity, and adequate sleep.
• Consult a Professional: Discuss your BMI result with a doctor who can provide a comprehensive health assessment and personalized advice.
• Set Realistic Goals: If your goal is to change your weight, use your BMI as a baseline to set achievable, sustainable goals.

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Frequently Asked Questions (FAQ)

What is a healthy BMI?
A healthy BMI for most adults falls within the Normal weight range of 18.5 to 24.9. This range is associated with the lowest risk of developing certain weight-related health problems.

How much should I weigh?
This is a common question, and a healthy weight calculator can provide a good answer. Instead of a single "ideal" number, BMI helps you identify a healthy weight range for your height. You can use the normal BMI range (18.5-24.9) and the BMI formula in reverse to calculate your ideal weight range.

Is this a BMI calculator for kg or pounds?
Both. Our calculator is designed for convenience, allowing you to enter your weight using either kilograms (BMI calculator kg) or pounds (BMI calculator pounds). Simply select the unit you prefer, and the tool will handle the conversion and calculation for you.