BMI Calculator

Your Body Mass Index (BMI) is a quick and scientifically accepted way to assess whether your weight is healthy compared to your height. Use our free online BMI calculator below to get instant and accurate results.

Creative BMI Calculator
Your BMI
0.0
Healthy Range
18.5–24.9
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Category: Unknown
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Recent BMIs

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    Advanced BMI Chart

    ♂️ Men

    Under
    <18.5
    Normal
    18.5–24.9
    Over
    25–29.9
    Obese
    ≥30
    Underweight
    Normal
    Overweight
    Obese

    ♀️ Women

    Under
    <18.5
    Normal
    18.5–24.9
    Over
    25–29.9
    Obese
    ≥30
    Underweight
    Normal
    Overweight
    Obese

    👶 Children (Percentile)

    Under
    <5th %ile
    Healthy
    5th–85th
    Over
    85th–95th
    Obese
    >95th
    Underweight
    Healthy
    Overweight
    Obese
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    What is BMI?

    BMI (Body Mass Index) is a number calculated using your weight (in kg) and height (in meters). It helps determine whether you’re underweight, normal, overweight, or obese. While it doesn’t measure body fat directly, it’s a reliable indicator for population-level health and screening.

    Understanding your Body Mass Index (BMI) is the first step toward a healthier lifestyle. BMI is a quick and reliable indicator used worldwide to evaluate whether your weight is appropriate for your height. It helps identify if you’re underweight, have a healthy weight, or are overweight or obese.

    At CalculateKaro.com, our Free Online BMI Calculator is designed to give you accurate results instantly. Just enter your weight and height, and the calculator will do the rest. No downloads, no sign-ups—completely free and easy to use.

    Our tool works for:

      • 👨 Adult Men

      • 👩 Adult Women

      • 👶 Children and Teens (2 to 18 years)

    For adults, BMI results are categorized into standard health ranges. For children, the calculator considers age and gender-specific percentile charts, making it suitable for parents and pediatricians.

    Use this tool to monitor your health, support your fitness goals, or prepare for a medical consultation. Knowing your BMI helps you take action—whether it’s maintaining your current weight or planning lifestyle changes.

    BMI Calculation Formula

    BMI = Weight (kg) / (Height in meters)²

    Example Calculation:
    If your weight is 70 kg and height is 1.75 meters:
    BMI = 70 / (1.75 × 1.75) = 70 / 3.0625 = 22.86

    BMI Chart for Adult Men

    BMI ValueWeight Status
    Below 18.5Underweight
    18.5 – 24.9Normal weight
    25.0 – 29.9Overweight
    30.0 and aboveObese

    🧠 Tip: A healthy BMI for most adult men is between 18.5 and 24.9.

    BMI Chart for Adult Women

    BMI ValueWeight Status
    Below 18.5Underweight
    18.5 – 24.9Normal weight
    25.0 – 29.9Overweight
    30.0 and aboveObese

    📌 Note: Women may have different body composition, but the same BMI classification applies.

    BMI for Children and Teens (2–18 Years)

    For children, BMI is calculated the same way but interpreted differently using age- and gender-specific percentile charts by WHO or CDC.

    Example:

    1. Calculate the child’s BMI using the formula above.

    2. Plot it against a standardized chart based on age and sex.

    Boys and Girls BMI Percentile Interpretation:

    PercentileWeight Status
    < 5th percentileUnderweight
    5th to <85thHealthy weight
    85th to <95thOverweight
    ≥ 95th percentileObese

    📌 Note: Women may have different body composition, but the same BMI classification applies.

    Frequently Asked Questions (FAQs) About BMI

    BMI (Body Mass Index) is a number calculated using your weight (in kilograms) and height (in meters). Formula: BMI = Weight / Height². It's used to classify your weight status.
    A normal BMI for adults (both men and women) ranges from 18.5 to 24.9. Below 18.5 is considered underweight; above 25 is overweight or obese.
    No, BMI is calculated the same way for both genders. However, body composition (fat vs. muscle) may differ, which BMI does not reflect.
    BMI is a useful screening tool, but it doesn't distinguish between fat and muscle mass. It should be used alongside other health indicators.
    Children's BMI is calculated the same way but interpreted using percentile charts based on age and gender. It’s different from adult classification.
    Underweight: <18.5, Normal: 18.5–24.9, Overweight: 25–29.9, Obese: 30+. These categories are set by WHO for adult populations.
    You can check your BMI once every few months unless you're on a specific health plan. It’s good for periodic monitoring of weight trends.
    Not always. BMI can misclassify muscular individuals as overweight due to muscle mass, which is heavier than fat.
    Consult a healthcare provider. A high BMI might require changes in diet, exercise, or medical advice to reduce health risks.
    Yes, the BMI formula is standard worldwide, but some countries use different classification ranges depending on ethnicity and health risks.