BMI Calculator — Check Body Mass Index Online

Free BMI calculator. Check your Body Mass Index online and find out if you are underweight, normal, overweight, or obese. Instant results.

Calculate BMI

How to Use

Select your unit system — Metric (cm, kg) or Imperial (ft/in, lbs).

Enter your height and weight, then click Calculate.

See your BMI, category, healthy weight range, and where you fall on the WHO scale.

What is BMI?

Body Mass Index (BMI) is a measure of body fat based on your weight relative to your height. It is used by healthcare professionals worldwide as a quick screening tool for weight categories that may lead to health problems. While BMI does not directly measure body fat, it correlates with more direct measures and is useful as a general indicator. Always consult a doctor for personalized health advice.

Frequently Asked Questions

How is BMI calculated?
BMI is calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). For imperial units, the formula is (weight in lbs × 703) / (height in inches)².
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classified as obese.
Is BMI accurate for everyone?
BMI is a general screening tool and may not be accurate for athletes, elderly, pregnant women, or people with high muscle mass. It does not distinguish between muscle and fat.
What units does this calculator support?
Both metric (cm, kg) and imperial (feet/inches, pounds). Select your preferred system using the toggle at the top of the form.
Should I make health decisions based on BMI alone?
No. BMI is one indicator among many. Consult a healthcare professional for a comprehensive assessment of your health.

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