BMI Calculator (Body Mass Index)
Use our free BMI calculator to quickly determine your Body Mass Index and understand your weight category. Based on World Health Organization (WHO) standards, this tool helps you assess whether you're underweight, normal, overweight, or obese. Calculate your BMI now and get personalized health insights to guide your wellness journey.
How to Use This Tool
1. Select Units
Choose Metric (cm/kg) or US (ft/in/lbs)
2. Enter Details
Age, gender, height, and weight
3. Get Insights
Click Calculate & see your results
Formula & Calculation
Your result is rounded to 1 decimal place for clarity.
Quick Reference BMI Table
| Height | Underweight (<18.5) | Normal (18.5–24.9) | Overweight (25–29.9) | Obese (≥30) |
|---|---|---|---|---|
| 5'0" (152 cm) | < 43 kg | 43 – 58 kg | 58 – 69 kg | ≥ 69 kg |
| 5'5" (165 cm) | < 50 kg | 50 – 68 kg | 68 – 81 kg | ≥ 81 kg |
| 5'10" (178 cm) | < 59 kg | 59 – 79 kg | 79 – 94 kg | ≥ 94 kg |
| 6'0" (183 cm) | < 62 kg | 62 – 83 kg | 83 – 100 kg | ≥ 100 kg |
How We Calculated
- Input: We collected your age, gender, height, and weight.
- Formula: Applied the standard BMI formula (weight divided by height squared). For US units, we used the 703 conversion factor.
- Result: Compared your BMI against WHO adult classifications to generate your status, healthy range, and personalized advice.
Why Trust This Tool?
Based on official guidelines
No server storage
Use instantly
Works on all devices
Latest health insights
No hidden charges
Accuracy & Standards
This calculator rounds results to 1 decimal place and follows the World Health Organization (WHO) BMI classification for adults aged 18 and over. The tool is for educational purposes and should not replace professional medical advice.
Unit Relationship
1 m = 100 cm
1 kg = 2.20462 lbs
1 ft = 12 in
1 lb = 0.453592 kg
Learn About BMI
What is BMI?
Body Mass Index is a measure of body fat based on height and weight, used to screen for weight categories.
Limitations
BMI doesn't distinguish between muscle and fat; athletes may have high BMI but low body fat.
BMI vs Body Fat
BMI is a screening tool; body fat percentage gives a more direct measure of body composition.
Real-World Examples
- Example 1: 30-year-old male, 180 cm, 75 kg → BMI 23.1 (Normal)
- Example 2: 45-year-old female, 5'4", 160 lbs → BMI 27.5 (Overweight)
- Example 3: 60-year-old male, 170 cm, 95 kg → BMI 32.9 (Obese)
Limitations of This Tool
- Does not measure muscle mass or body fat percentage directly.
- Not suitable for pregnant or lactating women.
- Athletes and bodybuilders may have a higher BMI due to muscle mass.
- Not intended for children under 18 (percentile charts are more appropriate).
Trust & Privacy
We take your privacy seriously. This tool:
- Does not store data on any server
- All calculations happen locally in your browser
- No cookies are used for this tool
References
- World Health Organization (WHO) – BMI Classification
- Centers for Disease Control and Prevention (CDC) – About Adult BMI
- National Institutes of Health (NIH) – Clinical Guidelines
Editorial Process
The Healthtus editorial team, consisting of health writers and certified nutritionists, reviews this tool regularly to ensure accuracy and alignment with the latest health guidelines. We update the content and references as new research emerges.
Last reviewed: July 2026