BMI Calculator
Calculate your Body Mass Index (BMI) from your weight and height, a widely used general indicator of whether your weight falls in a typical range for your height.
About this bmi calculator
BMI is the standard screening calculation used by health organizations worldwide as a quick, general indicator, not a diagnosis, of weight status relative to height.
How bmi calculator works
The formula is: BMI = Weight (kg) ÷ Height (m)². For example, someone weighing 70 kg at 1.75 m tall has a BMI of 70 ÷ (1.75 × 1.75) = 22.9, in the "normal weight" range.
Common uses
- Getting a quick general weight-status indicator
- Tracking BMI changes over time alongside a fitness goal
- Checking BMI before a medical form or health screening
How to use this tool
- Enter your weight in kilograms.
- Enter your height in centimeters.
- See your BMI and general category instantly.
What to know before using it
BMI does not account for muscle mass, bone density, age, or sex, an athlete with high muscle mass can show a "high" BMI despite low body fat. It is a general estimate, not a medical diagnosis, for health decisions, consult a qualified professional.
Privacy and browser-first processing
This tool runs entirely in your browser using JavaScript. Nothing you enter is uploaded or stored.
Frequently asked questions
What is a "normal" BMI range?
Generally, 18.5 to 24.9 is considered the typical range for adults, under 18.5 is categorized as underweight, and 25 and above as overweight or obese, though this varies by individual and population.
Is BMI accurate for athletes?
Not always, since BMI does not distinguish muscle from fat, a muscular athlete can register a high BMI while having low body fat.