BMI Calculator — Calculate Body Mass Index

Calculate your BMI (Body Mass Index) to check if you are underweight, normal weight, overweight, or obese. Get health insights and recommendations based on your BMI score.

Calculator

BMI Categories

Underweight< 18.5
Normal weight18.5 - 24.9
Overweight25.0 - 29.9
Obese≥ 30.0

BMI Calculation Results

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Enter your weight and height above to calculate your BMI

💡 Real-World Use Case

Scenario: Sarah is 30 years old, weighs 65 kg, and is 165 cm tall. Using this BMI calculator, her BMI is 23.9 (65 ÷ (1.65)² = 23.9), which falls in the normal weight category. This helps her understand that her current weight is healthy for her height, and she can focus on maintaining a balanced diet and regular exercise routine rather than weight loss.

Frequently Asked Questions

What is BMI?

BMI (Body Mass Index) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in meters squared.

What are the BMI categories?

BMI categories are: Underweight (BMI < 18.5), Normal weight (BMI 18.5-24.9), Overweight (BMI 25-29.9), and Obese (BMI ≥ 30). These ranges may vary slightly for different populations.

Is BMI accurate for everyone?

BMI is a useful screening tool but has limitations. It may not accurately reflect body fat in athletes (who have more muscle mass), pregnant women, the elderly, or people with certain medical conditions.

What should I do if my BMI is high?

If your BMI indicates overweight or obesity, consult with a healthcare provider for personalized advice. Focus on healthy eating, regular exercise, and lifestyle changes rather than quick fixes.

Can BMI be different for men and women?

The same BMI ranges apply to both men and women, but body composition differs. Women typically have more body fat than men at the same BMI, while men have more muscle mass.

How often should I check my BMI?

You can check your BMI whenever your weight or height changes significantly. For most adults, checking every few months is sufficient. Focus more on overall health habits than frequent BMI calculations.