BMI Calculator

Calculate your Body Mass Index (BMI) based on your height and weight. A quick way to determine if you're at a healthy weight.

Calculator
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Enter your height and weight to calculate BMI
Underweight <18.5
Normal 18.5-24.9
Overweight 25-29.9
Obese 30+

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Frequently Asked Questions

What is BMI?
BMI (Body Mass Index) is a measure of body fat based on height and weight. It's a simple calculation that can help indicate whether a person is underweight, normal weight, overweight, or obese.
How is BMI calculated?
For metric units: BMI = weight (kg) / height (m)². For imperial units: BMI = (weight (lbs) / height (in)²) × 703.
Is BMI accurate for everyone?
BMI is a general indicator and doesn't account for muscle mass, bone density, or overall body composition. Athletes with high muscle mass may have a high BMI without excess body fat. Similarly, older adults may have a normal BMI despite having less muscle mass.
What do the BMI categories mean?
Underweight: BMI below 18.5 | Normal: BMI 18.5-24.9 | Overweight: BMI 25-29.9 | Obese: BMI 30 or higher
Should I be concerned if my BMI is outside the normal range?
BMI is just one factor to consider. Consult with a healthcare provider for a complete assessment of your health, including other measurements and factors like diet, exercise, and overall fitness.
Does this tool store my data?
No. All calculations happen locally in your browser. Your weight and height data never leaves your device and is not stored on any server.

Understanding Your BMI Result

BMI Categories

Your BMI result falls into one of these categories:

  • Underweight (BMI < 18.5): You may need to gain weight to reach a healthy range. Consider consulting a healthcare provider.
  • Normal (BMI 18.5-24.9): You're at a healthy weight range. Maintain your current lifestyle.
  • Overweight (BMI 25-29.9): You may benefit from losing weight. Lifestyle changes can help.
  • Obese (BMI 30+): Health risks increase at this level. Consider consulting a healthcare provider.

Limitations of BMI

While BMI is a useful screening tool, it has limitations:

  • It doesn't distinguish between muscle and fat
  • It doesn't account for bone density
  • It may not reflect health status for athletes, elderly, or pregnant individuals
  • It doesn't consider distribution of body fat

Tips for Maintaining a Healthy Weight

Balanced Nutrition

Focus on a balanced diet rich in fruits, vegetables, whole grains, and lean proteins. Limit processed foods, added sugars, and excessive sodium.

Regular Physical Activity

Aim for at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous activity per week, combined with strength training.

Monitor Progress

Regular BMI checks can help you track your progress. Remember to focus on long-term trends rather than daily fluctuations.

Consult Professionals

For personalized advice, consult with healthcare providers or registered dietitians who can consider your individual health circumstances.