BMI Calculator

What Is BMI (Body Mass Index)?

BMI, or Body Mass Index, is a widely recognized method used by healthcare professionals to assess whether a person’s weight falls within a healthy range. It’s calculated using a simple formula:
BMI = weight (kg) ÷ height (m²)

So, for example, if you weigh 70kg and are 1.75 meters tall, your BMI would be 22.9 — which is considered normal.

While BMI doesn’t measure body fat directly, it provides a fast, science-backed way to identify possible weight-related health risks, including being underweight, overweight, or obese.

📌 Note: BMI is a general guide — it may not account for muscle mass, bone density, or individual body composition. For athletes or those with high muscle mass, BMI might not tell the full story.

🧮 How to Use This Free BMI Calculator

Using our free BMI checker is simple and takes just seconds:

• Enter your height and weight in either metric (kg/cm) or imperial (lbs/in) units.
• Click the calculate button.
• Instantly see your BMI score and which category you fall into.

Whether you’re checking your BMI for general health, fitness goals, or tracking weight changes, this tool works for everyone — including men, women, and teens (with caution).

📊 BMI Categories (Based on WHO Guidelines)

These are the official BMI classifications from the World Health Organization (WHO):

• Underweight: Less than 18.5
• Normal weight: 18.5 – 24.9
• Overweight: 25 – 29.9
• Obese: 30 or more

✅ If you’re in the overweight or obese range, it’s a good idea to speak with a doctor, nutritionist, or certified health coach.

Why BMI Still Matters Today

While BMI isn’t a perfect measurement — and doesn’t replace professional medical advice — it’s still a reliable first step to understanding your health profile.

Doctors, fitness coaches, and researchers still use BMI to:

• Spot early signs of weight-related health issues
• Evaluate weight status in relation to age and gender
• Offer a baseline for setting fitness or diet goals

When used alongside other metrics like body fat percentage, waist circumference, and TDEE (Total Daily Energy Expenditure), BMI can be part of a powerful toolkit for staying healthy.

FAQs

Is BMI accurate? BMI is a general indicator but doesn’t account for muscle mass or distribution of fat.

What is a healthy BMI? A healthy BMI typically ranges from 18.5 to 24.9.

Want to go deeper? Try our BMR Calculator or TDEE Calculator to understand your total energy expenditure.

Learn more from the CDC’s official BMI guide.