The BMI Calculator is a free online tool that helps you measure your Body Mass Index (BMI) — a widely used indicator of whether your weight is healthy relative to your height.
This calculator supports both Metric units (centimeters and kilograms) and Imperial units (feet, inches, and pounds), making it suitable for users around the world. Simply enter your age, gender, height, and weight, and the calculator will instantly display your BMI score along with your weight category and healthy weight range.
BMI is calculated using the standard formula: weight (kg) divided by height (m) squared. Based on your result, you will be classified into one of the following categories — Underweight, Normal Weight, Overweight, or Obese — as defined by the World Health Organization (WHO).
Whether you are tracking your fitness progress, managing your health goals, or simply checking where you stand, this BMI Calculator gives you fast, accurate, and easy-to-understand results in seconds — no sign-up or download required.
🚀 How to Use
11. Select your preferred unit system — click "Metric" for cm/kg or "Imperial" for ft/lbs.
22. Enter your Age in years.
33. Select your Gender — Male or Female.
44. Enter your Height:
5- Metric: enter height in centimeters (e.g. 175)
6- Imperial: enter feet and inches separately (e.g. 5 ft 9 in)
75. Enter your Weight:
8- Metric: enter weight in kilograms (e.g. 70)
9- Imperial: enter weight in pounds (e.g. 154)
106. Click the "Calculate BMI" button.
117. Your BMI score, weight category, healthy weight range, and status will appear instantly.
12The pointer on the BMI scale bar will also move to show exactly where your BMI falls — from Underweight to Obese.
13Tip: Click "Reset" to clear all fields and start a new calculation.
❓ Frequently Asked Questions
BMI stands for Body Mass Index. It is a simple measurement that uses your height and weight to estimate whether your body weight is in a healthy range. It is calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). For example, a person who is 70 kg and 1.75 m tall has a BMI of 22.9, which falls in the Normal Weight category.
According to the World Health Organization (WHO), a BMI between 18.5 and 24.9 is considered Normal or Healthy Weight for adults. A BMI below 18.5 indicates Underweight, 25 to 29.9 is Overweight, and 30 or above falls into the Obese category, which is further divided into Class I, II, and III.
The BMI formula is the same for both men and women, however the interpretation can differ slightly. Men and women naturally have different body fat distributions — women tend to have more body fat at the same BMI compared to men. BMI is a general screening tool and should always be interpreted alongside other health indicators such as waist circumference, body fat percentage, and medical history.
Yes. BMI does not directly measure body fat, so it may not be fully accurate for everyone. Athletes and highly muscular individuals may have a high BMI despite having very low body fat. Similarly, elderly people may have a normal BMI but still carry excess body fat. Pregnant women should not use BMI as a health indicator. Always consult a healthcare professional for a complete and accurate health assessment.
⚠️ Disclaimer
This BMI Calculator is provided for general informational and educational purposes only. The results generated by this tool are based on standard BMI formulas and WHO classification guidelines and are intended as a general health screening reference — not as medical advice or diagnosis.
BMI is a simplified measurement and does not account for individual factors such as muscle mass, bone density, body fat distribution, age, ethnicity, or overall physical health. A high or low BMI result does not necessarily indicate a medical condition.
If you have concerns about your weight, health, or BMI result, please consult a qualified healthcare professional, doctor, or registered dietitian for personalized medical advice.
We are not responsible for any health decisions, actions, or consequences taken based on the results provided by this calculator. Use this tool as a starting point for awareness, not as a substitute for professional medical evaluation.