Body Mass Index (BMI) is a number calculated from your weight and height used to categorise weight status as Underweight (under 18.5), Normal (18.5–24.9), Overweight (25–29.9) or Obese (30 and above).

Is BMI accurate for everyone?

BMI is a useful screening tool but has limitations. It does not distinguish between muscle and fat, so athletes may have a high BMI without excess body fat.

How is body fat percentage estimated?

The tool uses the Deurenberg formula: Body Fat % = (1.2 x BMI) + (0.23 x Age) - (10.8 x gender) - 5.4, where gender is 1 for male and 0 for female.

Is my data sent anywhere?

No. All calculations happen entirely in your browser. Your weight, height, age and gender are never sent to any server, stored or shared.

BMI Calculator

Calculate your Body Mass Index with metric or imperial units. See your healthy weight range, BMI category and personalised tips.

Units

Weight

Height

Your Measurements

Weight (kg) *

Weight (lb) *

Height (cm) *

Feet *

Inches *

Age > optional

Gender > optional

BMI

Healthy BMI range

18.5 – 24.9

BMI Scale

Under

Normal

Over

Obese

10 18.5 25 30 40+

⚖️

—

BMI Score

🏷️

—