How It Works

BMI is a simple screening tool used by healthcare providers worldwide.

1. Enter Your Stats

Choose metric or imperial units and input your weight and height.

2. See Your BMI

Get your exact BMI on a color-coded visual gauge showing your category.

3. Get Recommendations

Receive personalized tips based on your BMI category and goals.

BMI Calculator

Supports both metric (kg/cm) and imperial (lbs/ft-in) units.

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Enter your details above
Your BMI
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Category
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Ideal Weight Range
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To Reach Normal BMI
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Health Recommendations

    BMI Categories & Health Risks

    World Health Organization standard BMI classification for adults.

    CategoryBMI RangeHealth Risk Level
    UnderweightBelow 18.5Increased risk (malnutrition, bone loss)
    Normal Weight18.5 – 24.9Lowest health risk
    Normal (Upper)22.0 – 24.9Optimal range for longevity
    Overweight25.0 – 29.9Moderate increased risk
    Obese Class I30.0 – 34.9High risk
    Obese Class II35.0 – 39.9Very high risk
    Obese Class III40.0 and aboveExtremely high risk

    Frequently Asked Questions

    BMI (Body Mass Index) = weight(kg) ÷ height(m)². In imperial: BMI = 703 × weight(lbs) ÷ height(in)². For example, someone weighing 70kg at 1.75m has a BMI of 70 ÷ (1.75²) = 70 ÷ 3.0625 = 22.9, which falls in the normal category.
    WHO BMI categories for adults: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25.0–29.9), Obese Class I (30.0–34.9), Obese Class II (35.0–39.9), Obese Class III (40.0+). These categories correlate with risks for type 2 diabetes, cardiovascular disease, and other conditions.
    BMI has limitations. It cannot distinguish between muscle mass and fat — athletes may appear overweight despite having low body fat. It may also underestimate risk in people with high body fat but low muscle mass. Asian populations may have higher health risks at lower BMI values. Use BMI as one tool among many, alongside waist circumference, blood tests, and medical evaluation.
    A BMI between 18.5 and 24.9 is considered healthy for most adults. Research suggests BMI 22–23 may be associated with optimal longevity. For adults over 65, a slightly higher BMI (23–27) may be protective against muscle and bone loss. The ideal range can also vary by ethnicity — consult your doctor for personalized guidance.
    To lower BMI through fat loss: create a modest caloric deficit (500 calories/day = ~1 lb/week loss), prioritize whole foods and lean proteins, combine cardio exercise with strength training, get 7–9 hours of sleep (poor sleep disrupts hunger hormones), and manage stress. Aim for 0.5–1 kg per week — gradual loss is more sustainable and preserves muscle mass.