BMI Calculator
Child and teen BMI calculator (ages 2–19). Unlike adult BMI, children's results are interpreted using age and gender-specific growth chart percentiles from the CDC.
Other BMI calculators:
How it works
This bmi calculator runs entirely in your browser — no data is sent to any server. Simply fill in the fields above and the result updates instantly. You can copy the output with the copy button provided.
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a measure of body fat based on height and weight. It is calculated as weight (kg) divided by height (m) squared.
What is a normal 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 obese.
Is BMI accurate for everyone?
BMI is a useful screening tool but doesn't measure body fat directly. It may not be accurate for athletes, elderly people, or those with high muscle mass.
How is BMI calculated?
BMI = weight (kg) ÷ height (m)². For example, a person weighing 70kg at 1.75m has a BMI of 22.9.
Related Tools
Body Fat Percentage Calculator
Calculate your body fat % using the US Navy measurement method
BMR & TDEE Calculator
Find your daily calorie burn and set the perfect target for your goal
Ideal Weight Calculator
Find your ideal weight using 4 medical formulas + healthy BMI range
BMI Calculator
Calculate your Body Mass Index instantly