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BMI Calculator 2025

Calculate your Body Mass Index instantly with our medically accurate, free BMI calculator trusted by millions worldwide. Get personalized health insights and expert recommendations.

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Calculate Your BMI

Enter your height and weight to get instant, medically accurate BMI results

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Your BMI Result

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Body Mass Index
Enter your details to calculate BMI

BMI Categories

Category BMI Range Health Risk
Underweight < 18.5 Low
Normal weight 18.5 - 24.9 Minimal
Overweight 25.0 - 29.9 Moderate
Obese ≥ 30.0 High

⚠️ Medical Disclaimer

This BMI calculator is for informational purposes only. Results should not replace professional medical advice. Consult healthcare professionals for personalized health guidance.

Understanding BMI (Body Mass Index)

Comprehensive guide to Body Mass Index, health implications, and everything you need to know about BMI calculations and interpretations.

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What is BMI?

Body Mass Index (BMI) is a universally accepted measurement that calculates body fat based on height and weight. The BMI formula provides a quick screening tool to categorize weight status and assess potential health risks.

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BMI Categories Explained

BMI ranges categorize weight status with specific health implications: Underweight (BMI < 18.5), Normal weight (BMI 18.5-24.9), Overweight (BMI 25-29.9), and Obese (BMI ≥ 30) with varying health risks.

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Health Implications

BMI serves as a crucial screening tool for weight-related health issues. Higher BMI values correlate with increased risk for cardiovascular disease, type 2 diabetes, and other serious conditions.

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BMI Limitations

While BMI is useful for population screening, it has limitations. BMI doesn't differentiate between muscle mass and fat mass, and may not be accurate for athletes or elderly individuals.

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BMI Calculation Formula

The BMI formula is: BMI = weight (kg) ÷ height (m)². For imperial units: BMI = (weight in pounds ÷ height in inches²) × 703. Our calculator performs these calculations instantly.

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BMI and Ethnicity

BMI thresholds may vary by ethnicity. Asian populations may have higher health risks at lower BMI values, highlighting the importance of considering ethnic background in BMI interpretation.

Frequently Asked Questions

Everything you need to know about BMI calculation, interpretation, and health implications answered by medical experts.

What is a healthy BMI range?

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A healthy BMI range for adults is 18.5 to 24.9. This range is associated with the lowest risk of weight-related health problems and optimal health outcomes for most adults.

How accurate is BMI calculation?

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BMI is approximately 95% accurate for assessing weight status in the general population. However, it may not be as accurate for athletes with high muscle mass or older adults.

What BMI is considered obese?

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A BMI of 30.0 or higher is classified as obese. Obesity is further categorized into Class I (30.0-34.9), Class II (35.0-39.9), and Class III (40.0+) with increasing health risks.

How do I calculate BMI manually?

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BMI = weight (kg) ÷ height (m)². For imperial units: BMI = (weight in pounds ÷ height in inches²) × 703. Our calculator performs these calculations instantly and eliminates errors.

Can BMI be used for children?

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BMI can be calculated for children but must be interpreted differently using age and gender-specific percentiles. This calculator is designed for adults aged 18 and over.

Does muscle mass affect BMI accuracy?

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Yes, BMI doesn't distinguish between muscle and fat mass. Athletes or very muscular individuals may have high BMI due to muscle mass, not excess fat. Additional body composition tests may be needed.