Body Mass Index (BMI) is a simple screening tool to assess whether your weight falls in a healthy range for your height. BMI is a numerical value calculated from your weight and height. Our free BMI calculator provides instant results along with personalized weight recommendations based on World Health Organization (WHO) guidelines. While BMI isn’t a perfect measure (it doesn’t account for muscle mass or fat distribution), it’s widely used by healthcare professionals to identify potential weight-related health risks. Enter your details below to check your BMI and learn what it means for your health.
🧍♂️ BMI Categories (Adults)
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Underweight: BMI less than 18.5
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Normal weight: BMI 18.5 – 24.9
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Overweight: BMI 25 – 29.9
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Obesity Class I (Moderate): BMI 30 – 34.9
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Obesity Class II (Severe): BMI 35 – 39.9
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Obesity Class III (Very Severe / Morbid): BMI 40 or above
Source: Centers for Disease Control and Prevention (CDC) – BMI Categories
BMI is less accurate for athletes (muscle weighs more than fat) and pregnant women.
How to Calculate BMI?
Formula:
BMI = weight (kg) / (height (m))²
Example: For someone who is 1.75m tall and weighs 68kg:
68 ÷ (1.75 × 1.75) = 22.2 (Normal weight)
What are the Limitations of BMI?
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Doesn’t distinguish between muscle and fat.
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Doesn’t account for age, sex, or ethnicity (Asian populations may have higher health risks at lower BMIs).
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Alternatives: Waist-to-hip ratio, body fat percentage tests.
How to Improve Your BMI?
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For Underweight: Focus on nutrient-dense foods (avocados, nuts, lean proteins).
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For Overweight/Obesity:
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Aim for 150+ minutes of weekly exercise.
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Reduce processed sugars and refined carbs.
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Frequently Asked Questions
Q: Is BMI accurate for athletes?
A: No—BMI may classify muscular individuals as “overweight” even with low body fat.
Q: What’s a healthy BMI for seniors?
A: 23–27 is ideal (slightly higher reduces frailty risks).
Q: How often should I check my BMI?
A: Every 3–6 months unless pursuing rapid weight changes.