BMI Calculator - Compute & Reverse BMI (kg, lbs, cm, inches)

Use this free BMI Calculator to quickly find your Body Mass Index (BMI) and understand what your weight means for your health. Enter your height and weight in cm, inches, kg, or lbs — our tool automatically converts them and shows your BMI instantly.

What is BMI?

BMI (Body Mass Index) is a simple formula used to measure body fat based on your height and weight.

Formula: BMI = Weight (kg)/Height (m)²

This method is the same for men and women, and it helps classify individuals into categories such as underweight, healthy weight, overweight, or obese.

Reverse BMI Calculator - Find Your Ideal Weight

Want to know what weight you should have for a target BMI?

Use the Reverse BMI Calculator to calculate the ideal weight for your height.

Formula: Weight (kg) = BMI x Height (m)²

This feature is perfect if you're planning a fitness goal or tracking weight management progress.

BMI Charts

Category	BMI Range
Underweight	Below 18.5
Normal weight	18.5 - 24.9
Overweight	25 - 29.9
Obese	30 and above

Men vs. Women: How BMI Differs

Although BMI is calculated the same way for both genders, body composition varies.

• Men often have higher muscle mass, which can raise BMI without indicating extra fat.
• Women naturally have higher body fat percentages, meaning BMI results may reflect different health implications.

BMI should be interpreted along with body fat percentage, waist-to-hip ratio, and activity level for accurate health insights.

Why Use a BMI Calculator?

• Track your fitness progress
• Find your healthy weight range
• Understand how height and weight affect health
• Get quick unit conversions without switching pages