✦ US CDC 2026 Standards

Free BMI Calculator

Calculate your Body Mass Index instantly. Get your healthy weight range and personalized health recommendations.

Calculate Your BMI

Enter your height and weight below. Results update instantly — no button needed.

ft
in
lbs
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Category
Underweight
<18.5 Healthy
18.5–24.9 Overweight
25–29.9 Obese
≥30
Healthy Range (Imperial)—
Healthy Range (Metric)—

💡 Personalized Health Tips

    How to Use This Calculator

    Three simple steps to your BMI result.

    1️⃣ Choose Your Units

    Select Imperial (feet, inches, pounds) or Metric (centimeters, kilograms). Both produce identical results.

    2️⃣ Enter Measurements

    Input your height and weight. Measure height without shoes, and weigh yourself in the morning for best accuracy.

    3️⃣ View Results Instantly

    Your BMI, weight category, healthy weight range, and personalized health tips appear automatically as you type.

    4️⃣ Save & Track Progress

    Save calculations to history to track changes over time. Up to 10 records stored securely on your device.

    Understanding Body Mass Index

    What BMI measures — and what it doesn't tell you.

    📐 What is BMI?

    BMI is a numerical value derived from your weight and height, used by the CDC and WHO as a population-level screening tool for weight categories.

    Formula: Weight (kg) ÷ Height² (m)

    ⚠️ Limitations of BMI

    • Does not directly measure body fat
    • Doesn't account for muscle mass
    • Ignores fat distribution patterns
    • Less accurate for certain age groups
    • Not applicable to children under 20

    🩺 When to See a Doctor

    Consult a healthcare professional if your BMI is outside the healthy range, you have concerns about your weight, or want a comprehensive assessment including body composition tests.

    Related Health Articles

    Women's Health

    Healthy BMI for Women Over 40

    How hormonal changes affect healthy weight ranges after 40.

     Athletes

    BMI for Men with Muscle Mass

    Why standard BMI may not tell the whole story for muscular men.

     Weight Management

    How to Lower BMI Safely

    Evidence-based strategies without dangerous crash diets.

     Reference

    BMI Chart by Age and Gender

    A complete BMI reference guide for all demographics.

    Frequently Asked Questions

    According to the US CDC, a healthy BMI for adults is between 18.5 and 24.9. Below 18.5 is underweight, 25.0–29.9 is overweight, and 30.0 or above is obese. Always consult a doctor for a comprehensive assessment.
    The BMI formula and CDC categories are identical for adult men and women. However, at the same BMI value, women typically have more body fat than men, which is why doctors may also measure waist circumference and body composition.
    BMI is a useful population-level screening tool but has limitations. It doesn't distinguish muscle from fat, and athletes with high muscle mass may have a high BMI without excess body fat. Healthcare providers combine BMI with other measures for a full picture.
    No — this calculator is for adults aged 20 and older. For children and teens (ages 2–19), use the CDC's BMI-for-age percentile system or consult a pediatrician.
    Sustainable weight loss involves a modest calorie reduction, regular physical activity combining cardio and strength training, adequate sleep, stress management, and limiting ultra-processed foods. Always consult a healthcare provider before starting any weight loss program.