BMI Categories Chart

See where your BMI falls on the scale. Calculate your BMI first to see your position.

18.4 or less Underweight
18.5 - 24.9 Normal
25 - 29.9 Overweight
30+ Obese

BMI Categories Explained

Underweight
BMI: < 18.5

May indicate insufficient nutrition, underlying health conditions, or other issues.

Normal Weight
BMI: 18.5 - 24.9

Associated with the lowest health risks. Maintain with balanced diet and exercise.

Overweight
BMI: 25 - 29.9

May increase health risks. Consider lifestyle changes for better health.

Obese
BMI: 30+

Associated with increased health risks. Consult a healthcare provider for guidance.

Understanding BMI

Learn about Body Mass Index and what your BMI score means for your health

What is BMI?

Body Mass Index (BMI) is a measure of body fat based on height and weight. It's used as a screening tool to identify possible weight problems in adults.

Important Note

BMI is a screening tool and not a diagnostic tool. Consult with a healthcare provider for a complete health assessment and personalized advice.

How BMI is Calculated

The formula used by this BMI calculator is simple and widely accepted by health professionals.

BMI Formula

Formula: BMI = Weight (kg) / [Height (m)]²

Example: If your weight is 70 kg and height is 1.75 m, your BMI is calculated as:

70 / (1.75 × 1.75) = 22.9

Everything You Need to Know About BMI

Body Mass Index (BMI) is a simple number calculated from your height and weight. It gives a general idea of whether you’re underweight, healthy, overweight, or obese. While BMI is widely used, it’s important to remember that it’s just one of many ways to assess your health.

History of BMI

The concept of BMI was developed in the 19th century by Belgian mathematician and statistician Adolphe Quetelet. He created a formula to measure body mass relative to height, originally intended for population studies. Over time, it became a standard tool for doctors and health professionals worldwide.

Why BMI Matters

BMI is helpful because it can indicate potential health risks. People with very low BMI may face nutrient deficiencies or weakened immunity, while high BMI can increase the risk of heart disease, diabetes, and joint problems. However, BMI does not measure fat directly, so it should be considered alongside other indicators.

Limitations of BMI

While BMI is useful, it has some limitations:

  • It does not distinguish between muscle and fat. Athletes may have a high BMI but low body fat.
  • It doesn’t account for age, sex, or ethnicity differences.
  • It may not accurately reflect health for pregnant women or older adults.

Alternative Measurements

If you want a more complete view of your health, you can also check:

  • Waist-to-hip ratio: Measures fat distribution around your waist and hips.
  • Body fat percentage: Gives a direct estimate of fat mass vs. lean mass.
  • Waist circumference: Can predict risk for heart disease and diabetes.

Practical Tips to Maintain a Healthy BMI

  • Eat a balanced diet rich in vegetables, fruits, lean proteins, and whole grains.
  • Exercise regularly—both cardio and strength training.
  • Get adequate sleep and manage stress.
  • Stay hydrated and limit sugary drinks and processed foods.
  • Regularly track your BMI and other health markers to stay informed.

Medical Disclaimer

Disclaimer: This BMI calculator is for educational purposes only. It does not replace professional medical advice. Please consult a doctor or healthcare provider for personalized guidance.

References

Frequently Asked Questions

Answers to common questions about BMI and how it's calculated

BMI, or Body Mass Index, is a simple calculation used to determine whether a person is underweight, normal weight, overweight, or obese. It applies to adult men and women.

This BMI calculator uses your weight and height to compute a number that indicates your health category. It's ideal for both men and women.

The BMI formula is the same for all adults, but interpretation may vary slightly based on gender and fitness level. This tool works as a BMI calculator for women and a BMI calculator for men.

Enter your height in centimeters and weight in kilograms, then click "Calculate BMI." You'll see your BMI score and health classification instantly.

BMI is a good general health indicator, but it doesn't account for muscle mass or body composition. Athletes and individuals with higher muscle mass may have a higher BMI but low body fat.

A healthy BMI typically ranges between 18.5 and 24.9. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or more is obese.

No, this BMI calculator is designed for adults. Children's BMI is measured differently and based on age and gender percentiles.

The formula remains the same, but body fat distribution may differ. This tool works well as a BMI calculator male or BMI calculator female.

Checking your BMI once every few months is sufficient, unless you're actively monitoring weight changes or following a fitness plan.

Yes, individuals with more muscle may have a higher BMI without being overweight. BMI doesn't differentiate between fat and muscle mass.