Free BMI Calculator Tool – Calculate Your Body Mass Index and Check If You’re Healthy

BMI (Body Mass Index) is a measurement that uses your height and weight to estimate body fat and assess whether you’re underweight, healthy, overweight, or obese.

BMI = weight (kg) / [height (m)]². Our BMI Calculator does this instantly using either metric or imperial units.

According to WHO standards:

• Underweight: Below 18.5

• Normal: 18.5 – 24.9

• Overweight: 25 – 29.9

• Obese: 30 and above

While BMI is a reliable general indicator, it may not perfectly represent athletes or individuals with high muscle mass. Always consult a healthcare provider for a full assessment.

This calculator is designed for adults. For children or teens, age and gender-based BMI percentiles are recommended.

Yes — it’s 100% free, online, and easy to use on any device without sign-up.