BMI Calculator
Calculate your Body Mass Index and get personalized health insights
BMI Calculator: Check Your Body Mass Index Instantly
A BMI calculator helps you understand if your weight is healthy. Based on official WHO, CDC, and NHS guidelines, our free tool gives you instant results with personalized recommendations.
BMI Formula
Metric: BMI = Weight (kg) ÷ Height (m)²
Imperial: BMI = [Weight (lbs) ÷ Height (inches)²] × 703
BMI Categories (WHO Standards)
| Category | BMI Range | Health Risk |
|---|---|---|
| Underweight | Below 18.5 | Nutritional deficiency |
| Normal weight | 18.5 – 24.9 | Lowest risk |
| Overweight | 25 – 29.9 | Moderate risk |
| Obese | 30 and above | High risk |
BMI Visual Chart (Weight vs. Height)
| Height | Underweight | Normal | Overweight | Obese |
|---|---|---|---|---|
| 150 cm | < 42 kg | 42-56 kg | 56-67 kg | > 67 kg |
| 160 cm | < 48 kg | 48-64 kg | 64-76 kg | > 76 kg |
| 170 cm | < 54 kg | 54-72 kg | 72-86 kg | > 86 kg |
| 180 cm | < 60 kg | 60-81 kg | 81-97 kg | > 97 kg |
| 190 cm | < 67 kg | 67-90 kg | 90-108 kg | > 108 kg |
Official Health Resources
| Organization | Resource | Link |
|---|---|---|
| World Health Organization (WHO) | BMI Guidelines | who.int |
| CDC Healthy Weight | BMI Calculator | cdc.gov |
| NHS BMI Guide | BMI Tool | nhs.uk |
How to Use
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Choose Metric (kg/cm) or Imperial (lbs/in)
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Enter your weight
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Enter your height
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Get instant BMI score and health status
Understanding Your Results
Underweight (BMI < 18.5)
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Risk: Nutritional deficiencies, weak immunity
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Action: Consult doctor, increase calorie intake
Normal Weight (BMI 18.5 – 24.9)
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Risk: Lowest health risk
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Action: Maintain healthy habits, exercise regularly
Overweight (BMI 25 – 29.9)
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Risk: Diabetes, high blood pressure
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Action: Gradual weight loss, increase activity
Obese (BMI 30+)
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Risk: Heart disease, diabetes, sleep apnea
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Action: Consult healthcare provider immediately
Real Examples
| Person | Weight | Height | BMI | Status |
|---|---|---|---|---|
| Sarah | 68 kg | 165 cm | 25.0 | Overweight |
| Mike | 100 kg | 180 cm | 30.9 | Obese |
| Emma | 55 kg | 160 cm | 21.5 | Normal |
BMI Limitations
BMI does NOT measure body fat directly. It may not be accurate for:
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Athletes (high muscle mass)
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Pregnant women
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Elderly
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Children (use CDC percentile charts)
Tips for Healthy BMI
| Area | Recommendation |
|---|---|
| Diet | Fruits, vegetables, whole grains, lean protein |
| Exercise | 150 minutes weekly (CDC/NHS guideline) |
| Sleep | 7-9 hours nightly |
| Weight change | 1-2 lbs per week (safe rate) |
Frequently Asked Questions
Is BMI accurate? Yes for most adults, but consult a doctor for personalized advice.
What is healthy BMI? 18.5 – 24.9 according to WHO.
Free tool? Yes, completely free. No download needed.
Works on mobile? Yes, fully responsive.
Privacy? No data stored. All calculations local.
Conclusion
Your BMI calculator gives you quick insight into your health. Based on WHO, CDC, and NHS guidelines, use this free tool to check your status and take action.
Check your BMI today – it only takes 10 seconds.
Related Tools
References
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World Health Organization – Obesity and overweight
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CDC – About Adult BMI
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NHS – BMI calculator