BMI Calculator
Calculate your Body Mass Index using height and weight.
Quick Guide & Tips
How to Use the Calculator
Select metric or imperial units, enter your height and weight, then click “Calculate.”
You’ll immediately see your BMI number and category at a glance.
Tips for Interpreting Your Results
Use BMI as a guideline along with other measurements, such as body fat percentage, waist size, and muscle mass. This gives a more complete picture of your health than BMI alone.
Remember that people with more muscle may have a higher BMI without any negative health effects, while others with lower muscle mass may fall within a healthy range despite higher fat levels.
Consider your personal context, lifestyle, and goals when interpreting your BMI results.
Tracking Your Health Over Time
Regularly calculating your BMI helps you notice trends and make small adjustments to your diet and exercise routines.
Tracking over weeks and months can show progress that may not be visible on a day-to-day basis. Use this data as motivation to stay consistent with healthy habits.
Combine BMI tracking with other health measurements to get a more complete picture of your overall wellness.
Extra Tips for Healthy Living
Maintaining a healthy weight involves more than just BMI. Focus on a balanced diet, consistent exercise, and adequate sleep.
Set realistic goals and adjust your habits gradually. Sustainable changes are more effective than quick fixes.
Regular check-ins with healthcare professionals or fitness experts can provide personalized advice and ensure that your progress is on track.
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a number calculated from your height and weight that helps indicate whether you are underweight, normal weight, overweight, or obese. It’s a simple, widely used tool to assess body composition and monitor overall health.
What are the BMI categories?
BMI is classified into different categories:
- Underweight: Less than 18.5
- Normal weight: 18.5 - 24.9
- Overweight: 25 - 29.9
- Obesity: 30 and above.
Note: BMI is a guideline and unitless – it does not directly measure body fat or muscle mass.
Is BMI accurate?
BMI is a useful guideline for assessing body weight relative to height, but it’s not perfect. It does not directly measure body fat or muscle mass, so athletes or very muscular people may appear “overweight” despite being healthy. Use BMI as a quick reference, alongside other measurements like body fat percentage and waist size, to get a more complete picture of your health.
What is the difference between BMI and body fat percentage?
BMI shows how heavy you are for your height, while body fat percentage shows how much of your body is fat.
BMI is a basic calculation based only on height and weight. It compares body weight to height, but it does not measure body fat. Because of this, muscular individuals may be classified as overweight, while people with lower muscle mass and higher fat levels may appear normal.
Body fat percentage focuses directly on body fat and provides a clearer picture of body composition. Methods such as the Navy and RFM formulas estimate body fat using body measurements like waist, neck, height, and sometimes hips.