BMI Calculator

Calculate your Body Mass Index to understand your weight category and get personalized health recommendations based on WHO standards.

Enter Your Details

cm
kg

How It Works

Formula

Metric: BMI = weight (kg) / [height (m)]²
Imperial: BMI = [weight (lbs) / height (in)²] × 703

What is BMI?

Body Mass Index (BMI) is a simple calculation using height and weight to estimate body fat. It's used by healthcare providers as a screening tool to identify potential weight problems in adults. While not perfect, it provides a quick assessment of health risk categories.

Example

Example: A person who is 170 cm tall and weighs 70 kg has a BMI of 24.2.
Calculation: 70 ÷ (1.70)² = 70 ÷ 2.89 = 24.2 (Normal Weight)

References & Sources

📚
World Health Organization (WHO)

Global Health Observatory - BMI classifications and standards

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National Heart, Lung, and Blood Institute (NHLBI)

BMI Calculator and health category guidelines

📚
Centers for Disease Control and Prevention (CDC)

About BMI for adults - comprehensive guide

Frequently Asked Questions

What is a healthy BMI range? ▼
According to WHO standards, a healthy BMI for adults is between 18.5 and 24.9. Underweight is below 18.5, overweight is 25-29.9, and obese is 30 or above.
Is BMI accurate for everyone? ▼
BMI doesn't account for muscle mass, bone density, or fat distribution. Athletes and bodybuilders may have high BMI despite being healthy. It's best used as a screening tool alongside other health assessments.
How can I improve my BMI? ▼
Maintain a balanced diet with whole foods, exercise regularly (150 minutes/week), stay hydrated, get adequate sleep (7-9 hours), and consult a healthcare provider for personalized advice.
What is BMI Prime? ▼
BMI Prime is your BMI divided by 25 (upper limit of normal BMI). A value of 1.0 means you're at the upper limit of normal weight. Less than 1.0 is below this limit, greater than 1.0 is above.