BMI (Body Mass Index) is a measure of body fat based on height and weight. It's calculated as weight (kg) divided by height (m) squared. BMI is widely used by health professionals to screen for weight categories and health risks.

How is BMI calculated?

The formula is: BMI = weight (kg) ÷ [height (m)]². For imperial units: BMI = [weight (lbs) ÷ height (inches)²] × 703. This calculator handles both conversions automatically.

What are the BMI categories?

BMI Categories: Underweight (< 18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obese Class I (30-34.9), Obese Class II (35-39.9), Obese Class III (≥ 40)

Is BMI accurate for everyone?

BMI is a useful screening tool but has limitations. It doesn't account for muscle mass, bone density, or where fat is distributed. Athletes may have high BMI despite low body fat. Always consult healthcare professionals for personalized assessment.

What healthy BMI should I aim for?

A healthy BMI typically ranges from 18.5 to 24.9. However, optimal BMI varies by age, gender, ethnicity, and activity level. Consult with a doctor or nutritionist for personalized targets.

How can I change my BMI?

To improve your BMI: maintain balanced nutrition, engage in regular physical activity (150 min/week), ensure adequate sleep, manage stress, and consult healthcare professionals for personalized guidance.

BMI Calculator

Calculate your Body Mass Index and health insights

Unit System:

Metric (kg, cm) Imperial (lbs, inches)

Height (cm):

Weight (kg):

BMI Categories:

Underweight: BMI < 18.5
Normal Weight: 18.5 ≤ BMI < 25
Overweight: 25 ≤ BMI < 30
Obese: BMI ≥ 30

How to Use the BMI Calculator:

1 Select your preferred measurement system (Metric or Imperial).
2 Enter your height in the selected unit (cm or inches).
3 Enter your weight (kg or lbs).
4 Click "Calculate BMI" to see your result and health category.

Understanding BMI (Body Mass Index)

BMI is a simple weight-to-height ratio that provides a screening value for weight categories. It's widely used in healthcare to identify potential weight-related health risks and guide interventions.

The formula for BMI is: BMI = weight (kg) / height (m)²

BMI Categories and What They Mean

BMI Range	Category	Health Risk	Recommended Action
< 18.5	Underweight	May lack adequate nutrition	Consult healthcare provider; ensure adequate diet
18.5 - 24.9	Normal Weight	Low risk	Maintain current lifestyle; regular exercise
25 - 29.9	Overweight	Increased risk	Monitor weight; increase physical activity; balance diet
30 - 34.9	Obese (Class I)	High risk	Consult doctor; develop weight management plan
35 - 39.9	Obese (Class II)	Very high risk	Medical consultation recommended; lifestyle changes
≥ 40	Obese (Class III)	Extremely high risk	Professional medical intervention recommended

What You Should Know About BMI

BMI Strengths

Simple and quick calculation
No special equipment needed
Useful for population screening
Widely recognized by healthcare
Free and easy to calculate
Works across age groups

BMI Limitations

Doesn't measure body fat percentage
Doesn't account for muscle mass
Inaccurate for athletes/bodybuilders
Varies by ethnicity and age
Doesn't show fat distribution
Not suitable for children/elderly

Key Features of This BMI Calculator

Dual Unit Support

Choose between metric (kg, cm) and imperial (lbs, inches) measurements.

Instant Results

Get your BMI calculated immediately with detailed health insights.

Category Classification

See your BMI category and understand health risk levels.

No Data Collection

Privacy-first calculation—your data never leaves your device.

Practical Use Cases

Health Screening

Initial assessment for weight-related health conditions and preventive care planning.

Weight Management

Track BMI progress during weight loss or fitness improvement journeys.

Fitness Planning

Establish baseline metrics for personal training and fitness programs.

Progress Monitoring

Regular BMI checks to monitor health trends over time.

How to Improve Your BMI

Nutrition Tips

Eat balanced meals with vegetables
Control portion sizes
Reduce processed foods and sugar
Stay hydrated with water
Plan meals ahead

Physical Activity

Aim for 150 min moderate cardio weekly
Add strength training 2x per week
Increase daily movement
Find activities you enjoy
Consult fitness professionals

Important Health Disclaimer

⚠️ Medical Disclaimer: This BMI calculator is for informational purposes only and should not be considered medical advice. BMI is just one screening tool and doesn't account for individual health variations. Always consult with healthcare professionals for personalized health assessment, diagnosis, and treatment recommendations. This tool is not a substitute for professional medical advice.