What are the standard WHO BMI categories for adults?

Underweight: BMI less than 18.5; Normal weight: 18.5 to 24.9; Overweight: 25.0 to 29.9; Obesity: BMI 30.0 or higher.

Does BMI distinguish between muscle mass and body fat?

No. BMI does not measure body fat directly. Athletes with high muscle mass may register as "overweight" despite having low body fat percentages.

What is a healthy BMI range for most adults?

A BMI between 18.5 and 24.9 is considered the normal, healthy weight range associated with lowest risk for cardiovascular conditions.

How is BMI calculated using feet and pounds?

In imperial units, multiply weight in pounds by 703, then divide by height in inches squared: [weight (lbs) × 703] / [height (in)]².

Is my personal health data stored or recorded?

Never. Height, weight, and results exist only in your browser memory during your active session. No data is stored or uploaded.

Math Tools

BMI Calculator

Calculate Body Mass Index with health classification.

100% Private & Client-Side Execution

Health inputs and BMI scores remain strictly on your local device for complete medical privacy.

About BMI Calculator

BMI Calculator measures Body Mass Index, a widely used screening metric based on an individual's weight and height. It evaluates whether an adult falls into underweight, normal weight, overweight, or obesity categories according to World Health Organization (WHO) benchmarks.

How to Use BMI Calculator

Choose your preferred measurement system: Metric (cm and kg) or Imperial (feet, inches, and lbs).
Enter your height and current body weight.
Review your calculated BMI score displayed on the visual color-coded health gauge.
See your official WHO weight category classification (Underweight, Normal, Overweight, Obese).
Review your estimated ideal healthy weight range for your specific height.

Common Real-World Use Cases

Health-Conscious Individuals: Track personal fitness milestones and monitor weight management progress.
Personal Trainers & Coaches: Perform baseline body composition screenings for new fitness clients.
Nutritionists & Dietitians: Provide clients with educational BMI benchmarks during dietary consultations.
Medical Students & Researchers: Calculate epidemiological body mass indicators quickly using standard formulas.

Technical Specifications & Limitations

Uses standard WHO adult formula: BMI = weight (kg) / [height (m)]². Suitable for adults aged 18 and older.

Frequently Asked Questions

What are the standard WHO BMI categories for adults?: Underweight: BMI less than 18.5; Normal weight: 18.5 to 24.9; Overweight: 25.0 to 29.9; Obesity: BMI 30.0 or higher.
Does BMI distinguish between muscle mass and body fat?: No. BMI does not measure body fat directly. Athletes with high muscle mass may register as "overweight" despite having low body fat percentages.
What is a healthy BMI range for most adults?: A BMI between 18.5 and 24.9 is considered the normal, healthy weight range associated with lowest risk for cardiovascular conditions.
How is BMI calculated using feet and pounds?: In imperial units, multiply weight in pounds by 703, then divide by height in inches squared: [weight (lbs) × 703] / [height (in)]².
Is my personal health data stored or recorded?: Never. Height, weight, and results exist only in your browser memory during your active session. No data is stored or uploaded.